Storage lift for storing goods, processes and computer program products

Abstract

The invention relates to a storage lift (10) for storing goods (13). Furthermore, the invention relates to a method for communication between operators at at least two operating openings (14a, 14b) of such a storage lift (10) and to a computer program product.

Description

The invention relates to a storage lift for storing goods. Furthermore, the invention relates to a method for communication between operators of such a storage lift and to a computer program product. A storage lift of the type mentioned above serves for the automated provision of stored goods. The stored goods themselves are held in storage carriers arranged within the storage lift. For the storage and retrieval of goods, a transport device moves at least one storage carrier to an access opening. At the access opening, an operator and / or a robot can remove stored goods from the storage carrier for retrieval or place them onto the storage carrier for storage. The process of storage and retrieval can also be referred to as order picking. Furthermore, it is known to equip a storage lift with multiple operating openings to provide access to the storage lift at different levels. An example of a storage lift with multiple operating openings is described in WO 2024 / 256 203 A1. Furthermore, DE 35 14 932 A1 discloses a mechanical cabinet and the like with support units driven to at least one dispensing, lifting and lowering mechanism, with inserts which may be provided, for example, with extendable and lockable drawers and the like, or on which the stored goods are directly stored, for example, in inserts such as cassettes, drawers or compartments separated by transverse walls, in particular a paternoster cabinet in which the support units are suspended on endless chains guided by sprockets, characterized in that at least one ejection device for the inserts or cassettes and the like is arranged on the side of the support units opposite the dispensing mechanism and its drive is switched alternately with that of the support units. Furthermore, DE 10 2009 051 193 A1 discloses an automatic storage device with a loading and / or unloading opening, with a door element movable in a vertical direction for closing the loading and / or unloading opening and with a holding element that is mechanically coupled to the door element and counteracts a weight load of the door element. If a storage lift with multiple access points is needed by several operators simultaneously, waiting times and misunderstandings can arise regarding when the lift will be available. Currently, communication between operators at the access points is achieved by ringing a bell. For example, if the first access point is occupied and the operator at the second access point wants to store and / or retrieve goods, the operator at the second access point rings the bell, and a ringtone sounds for the operator at the first access point. The disadvantage of this method is that the bell only informs the operator that another operator is at the other access point. It does not provide the operator with the expected duration of use. Furthermore, the ringtone is often perceived as disruptive and therefore not used.The operator then waits, or asks the other operator directly how much longer the storage lift will be needed. The present invention is based on the objective of creating a storage lift, a method and a computer program product that enable improved communication between operators at different operating openings of a storage lift. To solve the problem, a storage lift with the features of claim 1, a method with the features of claim 10 and a computer program product with the features of claim 11 are proposed. Advantageous designs of the storage lift are the subject of the dependent claims. According to a first aspect of the invention, a storage lift for storing goods is proposed. The storage lift has at least two operating openings for loading and unloading goods, which are open in a first state and closed in a second state, an operating opening state detection device configured to detect the state of the operating openings, and a communication device for communication between operators at the operating openings.The communication device has a display device at each operating port which is configured to display information, an operating device at each operating port which is configured to operate the display device and to select at least one piece of information displayed on the display device, a storage device which is configured to store request information and response information associated with the request information for display on the display devices, and a control device which is configured to control the communication device.The control device causes query information to be displayed on the display device at a second operating port when the operating port status detection device detects that a first operating port is open, causes response information to be displayed on the display device at the first operating port based on the query information selected by means of the operating device at the second operating port, and causes the operating port status detection device to monitor the state of the first operating port based on the response information selected by means of the operating device. The storage lift allows for optimized communication between operators at different access points. Implementing a user-friendly communication interface that enables the maintenance and coordination of multiple operators increases the lift's efficiency. The use of predefined response information and answers facilitates intuitive, time-saving, and easily accessible communication between operators, as well as simple operation. The storage lift can be an automated storage rack or automated storage system. The storage lift can be designed as a vertical lift or as a carousel. Through the access openings, goods can be positioned for storage on a storage carrier and / or removed from a storage carrier for retrieval. These access openings can also be referred to as retrieval or loading and unloading openings. The storage lift can have more than two access openings. In this case, the first access opening is the one that is opened, and the other two openings then constitute the second access opening. The access openings can be closed by means of a locking device, such as a gate. In addition to at least two operating openings, the storage lift can have a housing, a plurality of storage positions arranged within the housing for receiving storage carriers, and an automatic transport device arranged within the housing. The storage carriers serve to hold the stored goods. The automatic transport device is configured to deliver storage carriers to the operating opening and / or the storage locations. The storage lift can also have light barriers within the operating opening for measuring the height of the goods to be stored. In addition, the storage lift can have a matrix display below the operating opening that shows the position of the goods to be retrieved on the storage carrier. The operating opening status detection device can have at least one sensor per operating opening that detects the status of the operating opening. Communication between operators at different operating ports is facilitated by the communication device. The display and operating devices can be controlled by the control unit. For this purpose, the display and operating devices can be connected to the control unit. The control unit can be a processor, a computer, and / or other suitable equipment. The display device can be designed as a display and / or a touchscreen. The operating device can be a control panel with a keyboard, a keyboard, a mouse, a trackball, and / or a touchscreen. If the operating device is a touchscreen, it is integrated into the display unit. Alternatively, the operating device can be a computer, tablet, and / or a mobile phone connected to the control unit of the communication device via a wired and / or wireless connection. Picking commands can be entered and / or confirmed using the operating device. The storage lift may also include a control device for controlling the storage lift. The control device may be connected to the control unit of the communication device. The control device may be a computer, a processor, or another suitable device. The control unit of the communication device may be part of the storage lift's control device. For example, the control unit of the communication device may be integrated into the control device as a computer program product, such as software. In an advantageous configuration, the query information includes a priority query and / or a processing time query. This allows the operator at the second access port to inform the operator at the first access port whether they themselves need immediate access to the storage lift, i.e., whether they have a high priority, or whether the other operator can submit a processing time query to the operator at the first access port, indicating how much longer the storage lift will be needed. Advantageously, the control unit opens a chat window with a quick-chat function on the display at the second access port.The quick chat function can include predefined request information, in particular at least one predefined priority request and at least one predefined processing time request, which are stored in the memory device and which the operator can select at the second operating port using the operating device. For example, the predefined priority request can be: "High priority: Request immediate access" and the predefined processing time request can be: "How long will access be needed?". In an advantageous embodiment, the response information associated with the processing time request includes time specifications. In another advantageous embodiment, the control unit causes a chat window with a quick-chat function to open on the display unit at the first operating port. Based on the request information selected by the operator at the second operating port, the quick-chat function can display predefined response information stored in the memory unit, which the operator at the first operating port can select using the operating unit. For example, if the operator at the second operating port has selected the processing time request, the quick-chat function can offer three time options.For example, the display at the first operating door can show times such as "less than 5 minutes", "less than 10 minutes", and / or "less than 15 minutes". This information tells the operator at the second operating door how much longer the operator at the first door will need the storage lift. In an advantageous configuration, the response information associated with the priority request includes a priority time indication and / or a priority answer. Thus, upon receiving a priority request, the operator at the first access point can choose between two responses in the quick chat window: either specifying a time (i.e., how long the storage lift will need) or providing a priority answer (i.e., indicating that the operator has a high priority). For example, the priority time indication could be "2 minutes." The priority answer could be, for example, "High priority myself." In an advantageous embodiment, when the priority response is selected via the operating device, the control unit causes the display at the second operating port to show a rejection of the priority request, while the display at the first operating port shows a response message. This informs the operator at the second operating port that the operator at the first operating port has a very high priority, so the operator at the first operating port rejects the priority request from the operator at the second operating port. For example, the following message can be displayed on the display at the second operating port: "Retrieval A: Priority request rejected." Furthermore, the operator at the first operating port can inform the operator at the second operating port how much longer they will need the storage lift. In an advantageous embodiment, the response information for the priority response includes a time indication. For this purpose, the control unit can open a chat window with a quick-chat function on the display unit at the first operating port. The quick-chat function can include predefined response information for a given query, such as "How much longer?", which is stored in the memory unit and which the operator at the second operating port can select using the operating unit. For example, the quick-chat function can include two time indications as response information, such as "at least 10 minutes" and "at least 5 minutes". Thus, the operator at the first operating port can select whether they need the storage lift for at least 10 minutes or at least 5 minutes. In an advantageous embodiment, the control unit includes a timing device with a timer function configured to count down a time value contained in the response information. Upon receiving the response information, the control unit causes the timing device to count down the time value contained in the response information. After the countdown, the operating door status detection device monitors the status of the first operating door. Thus, a timer is started, and after the timer has finished, the operating door status detection device checks whether the first operating door is closed. In an advantageous embodiment, when the operating door status detection device recognizes that the first operating door is open after the countdown, the display at the first operating door shows a message indicating that the door must be closed. This informs the operator at the first operating door that the time limit indicated in their response has expired and that the operating door must be closed so that the operator at the other operating doors can access the storage lift. For example, the message displayed to an operator at the first operating door could read: "Please close the retrieval door." In an advantageous embodiment, the control device causes the time selected by the operating device and / or the countdown of the time contained in the response information to be displayed on all display devices. This allows the operator at the first operating opening to know when to close it, and the other operator at the second operating opening to know when they have access to the storage lift. Advantageously, the control device causes the selected time and / or the countdown of the time contained in the response information to be displayed on the display devices. According to a further aspect of the invention, a method for communication between operators, in particular between operators at at least two operating openings, on a storage lift according to the invention is proposed. In the method, in a first step, a first operating opening of the storage lift is opened, in particular by an operator. In a second step, query information is displayed on a display device at a second operating opening of the storage lift when an operating opening status detection device detects that a first operating opening is open. In a third step, query information is selected by means of an operating device at the second operating opening, in particular by an operator. In a fourth step, response information based on the selected query information is displayed on a display device at the first operating opening.In a fifth step, a response information is selected by means of an operating device at the first operating opening, in particular by an operator. In a sixth step, the state of the first operating opening is monitored by means of the operating opening state detection device, based on the selected response information. Advantageously, a control unit causes the request information and / or the response information to be displayed on the display unit in the form of a chat window with a quick-chat function. Furthermore, the control unit can cause time information and / or a timer function to be displayed on the display unit. Additionally, the control unit can cause the operating door status detection device to monitor the status of the first operating door based on the selected response information. In an advantageous embodiment, the request information includes a priority request and / or a processing time request. Advantageously, a chat window with a quick-chat function opens on the display unit at the second operating port. The quick-chat function can include predefined request information, in particular at least one predefined priority request and at least one predefined processing time request, which are stored in the memory device and which the operator at the second operating port can select using the operating device. For example, the predefined priority request can be: "High priority: Request immediate access" and the predefined processing time request can be: "How much longer will access be needed?" In an advantageous embodiment, the response information associated with the processing time request includes time specifications. In another advantageous embodiment, a chat window with a quick-chat function opens on the display unit at the first operating port. Based on the request information selected by the operator at the second operating port, the quick-chat function can display predefined response information stored in the memory device, which the operator at the first operating port can select using the operating unit. For example, if the operator at the second operating port has selected the processing time request, the quick-chat function can offer three time options. For example, the time specifications "less than 5 minutes," "less than 10 minutes," and / or "less than 15 minutes" can be displayed on the display unit at the first operating port.The time information provides the operator at the second operating opening with the information on how much longer the operator at the first operating opening will need the storage lift. In an advantageous configuration, the response information associated with the priority request includes a priority time indication and / or a priority response. The priority time indication might be, for example, "2 minutes". The priority response might be, for example, "High priority even". In an advantageous embodiment, the display at the second operating port shows a rejection of the priority request, while the display at the first operating port shows a response. For example, the following message could be displayed on the display at the second operating port: "Retrieval A: Priority request rejected." Furthermore, the operator at the first operating port can inform the operator at the second operating port how much longer they will need the storage lift. In an advantageous embodiment, the response information for the priority response includes a time indication. For this purpose, a chat window with a quick-chat function can be opened on the display unit at the first operating port. The quick-chat function can include predefined response information, stored in the memory unit, for a predefined query such as "How much longer?". This response information can be selected by the operator at the second operating port using the control unit. For example, the quick-chat function can include two time indications as response information, such as "at least 10 minutes" and "at least 5 minutes". Thus, the operator at the first operating port can select whether they need the storage lift for at least 10 minutes or at least 5 minutes. In an advantageous embodiment, after receiving the response information, the time value contained in the response information is counted down, and after the countdown, the state of the first operating opening is monitored by the operating opening state detection device. Consequently, a timer is started, and after the timer has finished, the operating opening state detection device checks whether the first operating opening is closed. In an advantageous embodiment, the display at the first access opening shows information indicating that the access opening should be closed when the access opening status detection device recognizes that the first access opening is open after the countdown. For example, the following information could be displayed to the operator at the first access opening: "Please close the dispensing mechanism". In an advantageous embodiment, the time selected by means of the operating device and / or the countdown of the time contained in the response information is displayed on all display devices. According to another aspect of the invention, a computer program product is proposed which includes commands that cause the storage lift according to the invention to execute the method according to the invention. The following section describes a storage lift, a method for communication between operators at the operating openings of the storage lift, and further features and advantages using an exemplary embodiment, which is schematically illustrated in the figures. Figure 1 shows a schematic representation of a storage lift with two operating openings; and Figure 2 shows a schematic representation of a method for communication between operators at the operating openings of the storage lift from Figure 1. Figure 1 shows a storage lift 10 comprising a housing 12, a first and a second operating opening 14a, 14b (or retrieval) for storing and retrieving goods 13 arranged on storage carriers 15, which can be closed by means of a closing device 17 (schematically depicted as a gate). In Figure 1, the operating openings 14a, 14b are in a first state in which they are open. In a second state (not shown), the operating openings 14a, 14b are closed by lowering the closing device 17. As can also be seen in Figure 1, the operating openings 14a and 14b are located on opposite sides of the storage lift 10 and on different levels. Furthermore, the storage lift 10 has a communication device 16 for communication between operators not shown at the operating openings 14a, 14b and an operating opening status detection device 18 which is designed to detect the status of the operating openings 14a, 14b. The storage lift 10 also has an automatic transport device (not shown) arranged inside the housing 12, by means of which the storage carriers 15 are supplied to or removed from the operating openings 14a, 14b and / or storage locations (not shown) located inside the housing 12. As shown in Fig. 1, the communication device 16 has at least one display device 20 at each operating opening 14a, 14b, at least one operating device 22 at each operating opening 14a, 14b, a control device 24 and a storage device 25. The display unit 20 is configured to display query information and / or response information. For this purpose, the display unit 20 is designed as a display 26, which is arranged next to the operating opening 14a, 14b. The operating device 22 is configured to operate the display device 20 and to select at least one query and / or response information displayed on the display device 20. For this purpose, the operating device 22 is designed as a control panel 28, which includes a keyboard 30. The display 26 and the operating unit 22 are connected to the control unit 24, which is configured to control the communication unit 16. For this purpose, the display 26 and the control panel 28 are connected to the control unit 24 via a data cable 29. Alternatively, the display 26 and the control panel 28 can be connected to the control unit 24 via a radio connection. The control unit 24 can be configured as a computer or a processor. Furthermore, the control unit 24 can be part of a control device (not shown) for controlling the storage lift 10. In this case, the control unit 24 can be a computer program, for example, software, that is executed in the control device. The control unit 24 is also connected via a data cable 29 to the storage unit 25, which is configured to store query information and related response information for display on the display devices. The query information and / or response information can be displayed in the form of a chat window 32 with a so-called quick chat function 34. If the control unit 24 is configured as a computer, then the storage unit 25 is part of the computer. Alternatively, the storage unit 25 can be part of the control device of the storage lift 10 (not shown). The operating opening status detection devices 18 are connected to the control unit 24 via data cables 29. The operating opening status detection device 18 has a sensor 19 located below the operating opening 14a, 14b, which detects whether the locking device 17 is closed or, as shown in Fig. 1, opened. For this purpose, the operating opening status detection device 18 transmits a signal to the control unit 24, based on which the control unit 24 determines whether the operating opening 14a, 14b is open or closed. The following describes a communication procedure between operators (not shown) at the operating openings 14a, 14b of the storage lift 10, with reference to Fig. 2. In a first step, S1, an operator (not shown) opens the first operating opening 14a. This is detected by the operating opening status detection device 18 and transmitted to the control unit 24. At the same time, another operator (not shown) is already at the open second operating opening 14b. In a second step S2, the control unit 24 causes a chat window 32 with a so-called quick chat function 34 to open on the display unit 20 at the second operating port 14b. The quick chat function 34 comprises predefined query information stored in the memory unit 25, which the operator can select at the second operating port 14b using the operating unit 22, in particular the control panel 28. In this case, the Quick Chat function 34 includes two options for selecting request information: a first selection is a priority request PA, for example "High priority: Request immediate access", and a second selection is a processing time request BZA, for example "How long will access be needed?". In a third step S3, the control unit 24 causes the response information selected in the second step S2, i.e. the priority request PA or the processing time request BZA, to be displayed on the display unit 20 at the first operating opening 14a. Furthermore, in the third step S3, the control unit 24 causes a chat window 32 with a quick chat function 34 to open on the display unit 20 of the first operating port 14b. Based on the query information selected by the operator in the second step S2, the quick chat function 34 comprises predefined response information stored in the memory unit 25, which the operator can select at the first operating port 14a using the operating unit 22, in particular the control panel 28. If, in the second step S2, the operator has selected the processing time request BZA, then the Quick Chat function 34 includes the following three time options for selection: a first time option Z1, for example "less than 5 minutes", a second time option Z2, for example "less than 10 minutes", and a third time option Z3, for example "less than 15 minutes". If, in the second step S2, the operator has selected the priority request PA, then the Quick Chat function 34 includes the following two options for selecting response information: in a first sub-step S3.1, the selection of a priority time indication PZ, for example "2 minutes", or in a second sub-step S3.2, the selection of a priority response PA, for example "High priority". If, in the third step S3, the operator has selected the priority time specification PZ, then the control unit 24 causes the following message, for example, to be displayed on the display unit 20 at the second operating opening 14b in the first sub-step S3.1: “Priority request has been approved”. If, in the third step S3, the operator has selected the priority response PA, then in the second sub-step S3.2, the control unit 24 causes the following message MA to be displayed on the display unit 20 at the second operating opening 14b, for example: “Withdrawal A: Priority request rejected”. Simultaneously, in the second substep S3.2, the control unit 24 causes a chat window 32 with a quick chat function 34 to open on the display unit 20 at the second operating port 14b. The quick chat function 34 comprises predefined response information stored in the memory unit 25 for a given query, for example, "How much longer?", which the operator can select at the second operating port 14b using the operating unit 22, in particular the control panel 28. In this case, the quick chat function 34 includes two time values ​​as response information: a fourth time value Z4, for example, "at least 10 minutes", and a fifth time value Z5, for example, "at least 5 minutes". In a fourth step S4, the control unit 24 causes the following information “Withdrawal A still requires:” to be displayed on all display units 20 in combination with one of the time values ​​Z1, Z2, Z3 selected in the third step S3, the priority time value PZ or one of the time values ​​Z4, Z5 selected in the second sub-step S3.2. In a fifth step S5, the control unit 24 causes a timer function of a time measuring device of the control unit 24 to be displayed on all display units 20, counting down the time value Z1, Z2, Z3 selected in the third step S3, the priority time value PZ or the time value Z4, Z5 selected in the second substep S3.2. When the timer has finished counting down, the control unit 24, in a sixth step S6, activates the operating opening status detection device 18, which monitors the status of the first operating opening 14a. If, after the countdown in the sixth step S6, the operating opening status detection device 18 detects that the first operating opening 14a is closed, the communication procedure ends. If, in the sixth step S6, the operating opening status detection device 18 detects that the first operating opening 14a is still open after the countdown, then, in a seventh step S7, the control unit 24 causes information to be displayed on the display device 20 at the first operating opening 14a. For example, the following message is displayed on the display device 20 at the first operating opening 14a: "Please close the operating opening." If the first operating opening 14a is subsequently closed, this is detected by the operating opening status detection device 18 and transmitted to the control unit 24, and the communication procedure is terminated. In an embodiment not shown, the storage lift 10 can have more than two operating openings 14a, 14b. In this case, the first operating opening 14a corresponds to the one opened in the first step S1, and the other operating openings correspond to the second operating opening 14b. The storage lift 10 and the procedure optimize communication between operators at different operating openings 14a, 14b. The efficiency of the storage lift 10 is increased by implementing a user-friendly communication interface that enables the maintenance and coordination of multiple operators. The use of predefined responses allows for intuitive, time-saving, and easily accessible communication between operators. Reference symbol list 10 Storage lift 12 Housing 13 Stored goods 14a First operating opening 14b Second operating opening 15 Stored goods carrier 16 Communication device 18 Operating opening status detection device 19 Sensor 20 Display device 22 Operating device 24 Control device 25 Storage device 26 Display 28 Control panel 29 Data line 30 Keyboard 32 Chat window 34 Quick chat function S1 First step S2 Second step PA Priority request BZA Processing time request S3 Third step Z1 First time indication Z2 Second time indication Z3 Third time indication PZ Priority time indication PA Priority response S3.1 First sub-step S3.2 Second sub-step MA Message Z4 Fourth time indication Z5 Fifth time indication S4 Fourth step S5 Fifth step S6 Sixth step S7 Seventh step

Claims

Storage lift (10) for storing goods (13), comprising at least two operating openings (14a, 14b) for loading and unloading goods, which are open in a first state and closed in a second state, an operating opening state detection device (18) which is configured to detect the state of the operating openings (14a, 14b), and a communication device (16) for communication between operators at the operating openings (14a, 14b);wherein the communication device (16) comprises: a display device (20) at each operating port (14a, 14b) configured to display information; an operating device (22) at each operating port (14a, 14b) configured to operate the display device (20) and to select at least one piece of information displayed on the display device (20); a storage device configured to store query information and response information related to the query information for display on the display devices; and a control device (24) configured to control the communication device (16); wherein the control device (24) causes query information to be displayed on the display device (20) at a second operating port (14b) when the operating port state detection device (18) detects that a first operating port (14a) is open;that response information is displayed on the display device (20) at the first operating port (14a), based on the query information selected by means of the operating device (22) at the second operating port (14b); and that the operating port status detection device (18) monitors the status of the first operating port (14a), based on the response information selected by means of the operating device (22). Storage lift (10) according to claim 1, characterized in that the request information includes a priority request (PA) and / or a processing time request (BZA). Storage lift (10) according to claim 2, characterized in that the response information associated with the processing time request (BZA) includes time specifications (Z1, Z2, Z3). Storage lift (10) according to claim 2 or 3, characterized in that the response information associated with the priority request (PA) includes a priority time indication (PZ) and / or a priority response (PA). Storage lift (10) according to claim 4, characterized in that when the priority response (PA) is selected by means of the operating device (24), the control device (24) causes a rejection of the priority request (PA) to be displayed on the display device (20) at the second operating opening (14b) and an answer information to be displayed on the display device (20) at the first operating opening (14a). Storage lift (10) according to claim 5, characterized in that the response information for the priority response (PA) includes a time indication (Z4, Z5). Storage lift (10) according to one of claims 2 to 6, characterized in that the control device (24) has a time measuring device with a timer function which is configured to count down a time indication (Z1, Z2, Z3, Z4, Z5, PZ) contained in the response information, wherein the control device (24) causes the time measuring device to count down the time indication (Z1, Z2, Z3, Z4, Z5, PZ) contained in the response information after receiving the response information and that after the countdown the operating opening status detection device (18) monitors the state of the first operating opening (14a). Storage lift (10) according to claim 7, characterized in that the control device (24), when the operating opening status detection device (18) detects that the first operating opening (14a) is open after the countdown, causes information to be displayed on the display device (20) at the first operating opening (14a) to close the operating opening (14a). Storage lift (10) according to one of claims 2 to 8, characterized in that the control device (24) causes the time value (Z1, Z2, Z3, Z4, Z5, PZ) selected by means of the operating device (22) and / or the countdown of the time value (Z1, Z2, Z3, Z4, Z5, PZ) contained in the response information to be displayed on all display devices (20). A method for communication between operators of a storage lift (10) according to any one of claims 1 to 9, comprising the following steps: a. Opening a first operating opening (14a) of the storage lift (10); b. Displaying request information on a display device (20) at a second operating opening (14b) of the storage lift (10) when an operating opening status detection device (18) detects that a first operating opening (14a) is open; c. Selecting request information by means of an operating device (22) at the second operating opening (14b); d. Displaying response information on a display device (20) at the first operating opening (14a) based on the selected request information; e. Selecting response information by means of an operating device (22) at the first operating opening (14a); and f.Monitoring the state of the first access opening (14a) using the access opening state detection device based on the selected response information. Computer program product comprising commands that cause the storage lift according to one of claims 1 to 9 to execute the method according to claim 10.

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