Multi-stage combined protection storage library

Abstract

The invention relates to the technical field of liquid storage, in particular to a multi-stage combined protection storage library. Comprising a storage warehouse arranged above the ground, a liquid inlet is formed in the top of the storage warehouse, a liquid outlet is formed in the bottom of the storage warehouse, and the storage warehouse is divided into an inner cabin body and an outer cabin body by a partition plate. The multi-stage combined protection component can serve as a protection shell for the liquid storage cabin body of the inner ring, if a certain sub-cabin body leaks due to impact or earthquakes and the like, only liquid storage objects in one sub-cabin body can be influenced, the possibility of loss and subsequent harm is reduced to the maximum extent, and under protection of the multi-stage combined protection component, the liquid storage cabin body can be protected by the multi-stage combined protection component. And the harm of the explosion can be reduced to the minimum.

Description

Technical Field

[0001] This patent relates to the technical field of storage of hazardous liquids, in particular to a multi-level joint protection storage library. Background Art

[0002] Liquid storage warehouses are often used to store hazardous chemicals. Hazardous chemicals refer to highly toxic chemicals and other chemicals that are harmful to humans, facilities, and the environment, such as toxicity, corrosion, explosion, combustion, and combustion-supporting properties. Hazardous chemicals include: flammable liquids, oxidizing liquids, etc. They are widely used in liquid filling stations, industrial production liquid storages and other related places. Liquid storage warehouses may be subject to collisions, earthquake waves and other accidents, and the liquid storage may leak or explode, causing casualties and economic losses. At present, liquid storage structures generally use two structures: above-ground or underground. Although underground liquid storage structures are safer, their construction costs are too high, and the liquid storage maintenance costs are higher. Therefore, in most areas, above-ground liquid storage structures are generally chosen.

[0003] Composite structures have been increasingly developed in research and application at home and abroad since World War II due to their light weight and relatively high relative rigidity. They are currently widely used in aerospace, transportation, military protection and other fields. The composite protective structure designed on the outside of the liquid storage tank can effectively prevent damage to the shell caused by impact and enhance the overall impact resistance of the liquid storage tank. This patent designs a new liquid storage structure through the technical route of anti-penetration, anti-leakage and anti-explosion. Through multi-level joint protection, it effectively prevents liquid storage leakage and subsequent explosion and combustion caused by leakage. Summary of the invention

[0004] The object of the present invention is to provide a multi-level joint protection storage library to solve the problems raised in the above background technology.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a multi-level joint protection storage, comprising a storage, which is arranged above the ground, with a liquid inlet at the top and a liquid outlet at the bottom, the storage is divided into an inner cabin and an outer cabin by a partition, the inner cabin has a liquid inlet at the top and a liquid outlet at the bottom, and the outer cabin has a liquid outlet at the bottom, the inner cabin is divided into a plurality of inner cabins by a plurality of horizontally arranged partitions, a first liquid outlet is arranged on the partition between two adjacent inner cabins, and the outer cabin is divided into a plurality of The outer subdivided body, the vertical heights of the top surfaces of the plurality of outer subdivided bodies decrease in sequence from the highest outer subdivided body until the outer subdivided body with the lowest vertical height of the top surface, a second liquid passing trough is arranged on the partition between adjacent outer subdivided bodies, the horizontal position of the second liquid passing trough is lower than the upper surface of the lower outer subdivided body, the two outer subdivided bodies with the largest vertical height difference of the top surfaces are in a closed state, a third liquid passing port is arranged on the partition between the inner subdivided body with the highest vertical height in the inner cabin and the outer subdivided body with the highest vertical height of the top surface, and the vertical height of the third liquid passing port is lower than the upper surface of the outer subdivided body.

[0006] Furthermore, several explosion suppression balls are respectively arranged in several inner compartments and outer compartments, and the first liquid outlet, the second liquid outlet, the third liquid outlet, the liquid inlet and the liquid outlet are provided with filter screens matching their shapes, and the filter screen aperture is smaller than the explosion suppression ball diameter.

[0007] Furthermore, the storage reservoir shell and partition have the same cross-sectional structure, a double-layer structure, a gap is provided inside, and the gap is filled with filling fluid. A self-sealing layer is also provided on the inner surface where the shell, partition and filling fluid meet.

[0008] Furthermore, liquid outlets are arranged at the bottoms of the plurality of outer sub-cabins in the outer cabin.

[0009] Furthermore, a liquid outlet tank is arranged below the liquid outlet arranged at the bottom of the inner cabin body and the outer cabin body, a liquid outlet is arranged at the bottom of the liquid outlet tank, and a support column is arranged below the liquid outlet tank.

[0010] Furthermore, a liquid inlet is disposed on the top of each of the plurality of outer sub-cabins in the outer cabin.

[0011] Furthermore, protective covers are arranged above the inner cabin body and the outer cabin body, and the protective covers include a first protective cover and a second protective cover. The diameter of the first protective cover is larger than the diameter of the inner cabin body, and the outer circle diameter of the second protective cover is larger than the outer circle diameter of the outer cabin body. The first protective cover is arranged above the second protective cover, and the outer circle diameter of the second protective cover is larger than the outer circle diameter of the first protective cover. An opening is arranged at the center of the second protective cover, and the diameter of the opening is smaller than the outer circle diameter of the first protective cover.

[0012] Furthermore, a multi-level joint protection storage storage also includes a liquid inlet pipe, which enters the opening in the center of the second protective cover from the gap between the first protective cover and the second protective cover, and is divided into several branch pipes from the opening, which are respectively connected to the liquid inlets arranged above the inner cabin and the outer cabin.

[0013] Furthermore, the liquid inlet pipe is provided with several branch pipes on the outside of the storage tank, and the branch pipes enter the gap between the first protective cover and the second protective cover from several directions. An opening is provided in the center of the second protective cover to merge into one pipe, and this root pipe is further divided into several branch pipes, which are respectively connected to the liquid inlets provided above the inner cabin and the outer cabin.

[0014] Furthermore, the protective cover also includes a third protective cover, which is arranged below the second protective cover and above the inner cabin body and the outer cabin body. The outer circle diameter of the third protective cover is the same as the outer circle diameter of the third protective cover, and it completely covers the upper surface of the inner cabin body and the outer cabin body, and the third protective cover is provided with a groove for the liquid inlet pipe to pass through.

[0015] Compared with the prior art, the present invention has the following advantages: (1) The filling fluid of the present invention is composed of shear-hardening glue, which is a non-Newtonian fluid whose main component is polyborosiloxane. It has strong fluidity and impact resistance. After being penetrated, it can perform simple self-repair due to the characteristics of the fluid, which can effectively prevent further leakage of the internal liquid.

[0016] (2) The non-metallic barrier explosion suppression ball of the present invention divides the space into several "small chambers" or "cavities", which can effectively curb the spread of flames and sharply attenuate the explosion pressure wave. At the same time, the high specific surface area of ​​the material can absorb and conduct a large amount of heat energy, destroy the explosion conditions of the combustion medium, thereby reducing the flame combustion speed and ensuring the safety and storage of the fuel liquid. In addition, compared with other explosion suppression materials, the non-metallic explosion suppression ball accounts for a relatively small proportion, only about 5% of the total volume of the liquid reservoir, which can reduce the weight of the liquid reservoir to a certain extent and increase the transportation quality.

[0017] (3) The liquid storage of the present invention adopts a stepped design. When adding liquid, the liquid is added from the inner sub-compartment with the highest top height, and the liquid will flow into the inner sub-compartment at the bottom. After the inner compartment is full, the liquid will flow into the highest outer sub-compartment from the third liquid outlet at the top of the partition between the inner compartment and the outer compartment. After it is full, the liquid will flow into the adjacent outer sub-compartment with the second highest height, and so on until the outer storage tank is fully filled. The advantage of this approach is that it can ensure that there is at most one compartment that is not full of liquid in each compartment, and if the storage compartment only fills the compartment in the inner circle, the outer circle compartment is in an empty state, which can act as a protective shell for the inner circle liquid storage compartment. If a compartment leaks due to impact or earthquake, it will only affect the liquid storage in one compartment, thereby minimizing the loss and the possibility of subsequent harm. In addition, under the protection of multi-stage joint protective components, the harm of such explosion can be minimized.

[0018] (4) The protective cover is set on the top of the cabin. Because the top of the cabin is an irregular structure and the protective cover is a plane, a cavity is formed between the inside of the protective cover and the top of the cabin. This cavity can not only buffer the fragments entering the inside of the protective cover, but also place some components, such as liquid pumps and other devices, which can not only maximize the use of space but also protect the cabin. The protective cover adopts a multi-layer design, which further enhances the safety of the top surface of the storage tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Repository diagram.

[0020] Figure 2 Schematic diagram of the storage storage module.

[0021] Figure 3 Schematic diagram of the repository disassembly.

[0022] Figure 4 Schematic diagram of the storage facility where explosion suppression balls are placed.

[0023] Figure 5 Schematic diagram of the liquid inlet and filter of the cabin.

[0024] Figure 6 Schematic diagram of the partition and shell structure.

[0025] Figure 7 Schematic diagram of top view of the first and second protective covers.

[0026] Figure 8 Schematic diagram of the cross-section of the first and second protective covers.

[0027] Among them, the inner cabin 100, the first inner cabin 110, the second inner cabin 120, the third inner cabin 130, the fourth inner cabin 140, the fifth inner cabin 150, the outer cabin 200, the first outer cabin 210, the second outer cabin 220, the third outer cabin 230, the fourth outer cabin 240, the fifth outer cabin 250, the sixth outer cabin 260, the seventh outer cabin 270, the eighth outer cabin 280, the filling fluid 300, the partition 310, the filter 400, the first liquid port 410, the second liquid port 420, the third liquid port 430, the explosion suppression ball 500, the protective cover 600, the first protective cover 610, the second protective cover 620, the third protective cover 630, the liquid inlet pipe 700, the liquid outlet 800, and the support column 900. DETAILED DESCRIPTION

[0028] The present invention aims to provide a multi-level joint protection storage library to address the deficiencies of existing storage library technologies, which is specifically implemented by the following technical solutions: Reference Figure 1 A multi-level joint protection storage tank includes a storage tank arranged above the ground, with a liquid inlet at the top and a liquid outlet at the bottom. This design facilitates the storage tank to store liquid in and out, and the liquid inlet and the liquid outlet are both provided with valves that can be opened and closed independently.

[0029] Reference Figure 2 , Figure 3 The storage tank is divided into an inner cabin 100 and an outer cabin 200 by a partition 310. The inner cabin 100 is provided with a liquid inlet at the top and a liquid outlet at the bottom. The outer cabin 200 is provided with a liquid outlet at the bottom. The inner cabin 100 is divided into a plurality of inner cabins by a plurality of horizontally arranged partitions 310. A first liquid passage 410 is provided on the partition 310 between two adjacent inner cabins. Liquid is added from the first inner cabin 110 at the top. The first inner cabin 110 flows into the second inner cabin 120 below it, and then flows downward in turn into the third inner cabin 130 and the fourth inner cabin 140 until the fifth inner cabin 150 at the bottom. After the fifth inner cabin 150 is filled, the fourth inner cabin 140 is filled, and then it flows upward in turn until the first inner cabin 110. This design enables a plurality of independent cabins to be formed in the inner cabins, further enhancing the protection performance of the storage tank.

[0030] Reference Figure 2 , Figure 3The interior of the outer cabin 200 is divided into a plurality of outer cabins by a plurality of vertically arranged partitions 310. The vertical heights of the top surfaces of the plurality of outer cabins are successively decreased from the first outer cabin 210 which is the highest, the second outer cabin 220, the third outer cabin 230, the fourth outer cabin 240, the fifth outer cabin 250, the sixth outer cabin 260, the seventh outer cabin 270, to the eighth outer cabin 280 which has the lowest vertical height of the top surface. The partitions 310 between the adjacent outer cabins are provided with second liquid-passing grooves 420. The horizontal position of the second liquid-passing grooves 420 is lower than that of the lower outer cabins. The upper surface of the compartment body, the two outer compartment bodies with the largest vertical height difference on the top surface are in a closed state, and the partition plate 310 between the inner compartment body with the highest vertical height and the outer compartment body with the highest vertical height on the top surface in the inner compartment body 100 is provided with a third liquid port 430, and the vertical height of the third liquid port 430 is lower than the upper surface of the outer compartment body. This design enables that when liquid storage is added from the highest first outer compartment body 210, only when the highest first outer compartment body 210 is in a full warehouse state, the liquid storage will flow into the next second outer compartment body 220, and if the compartment body is in an empty warehouse state or full warehouse state, the liquid storage will flow into the next second outer compartment body 220. When the cabin is in a semi-liquid state, the possibility of explosion is low, because when the cabin is in an empty state, there is almost no liquid inside, and when the cabin is full, there is almost no air inside. In these two states, the cabin is not easy to explode. Only when the cabin is in a semi-liquid state, the air inside the cabin and the volatile substances of the dangerous goods are within the explosive threshold. Because the interior is closed, the proportion of volatile substances of the dangerous goods in the air is conducive to the occurrence of explosion. At this time, the explosion is most likely to occur. Therefore, this design divides the cabin into several parts and adds liquid storage in sequence. When the cabin of the inner divided cabin is adding liquid storage, the outer divided cabin is The hollow cabin body of the circle can act as a protective shell, enhancing the anti-strike capability of the storage structure. The structure adopts a split design. Only when the impact or other damage happens to the cabin body in the half-cabin state, the storage may have a large-scale liquid leakage or deflagration or explosion. The structure of this design also ensures that only one cabin body among all the cabin bodies will be in the half-cabin state, and the other cabin bodies can only be in the half-cabin or full-cabin state. All of them are completed by mechanical structure, without the need for electric drive or other modes of driving, which further improves the stability and safety of the structure and can maximize the stability of the storage structure. The first liquid port 410, the second liquid port 420, and the third liquid port 430 are all provided with valves that can be opened and closed independently, ensuring the independence of each cabin body.

[0031] Reference Figure 4 , Figure 5, several explosion suppression balls 500 are respectively arranged in several inner compartments and outer compartments, and the first liquid port 410, the second liquid port 420, the third liquid port 430, the liquid inlet and the liquid outlet are provided with filter screens 400 matching their shapes, and the aperture of the filter screen 400 is smaller than the diameter of the explosion suppression ball 500. The explosion suppression ball 500 can cover the cross section of the compartment where it is located. When the storage warehouse deflagration or explosion occurs due to various reasons, the explosion suppression ball 500 divides the space where it is located into several "small rooms" or "cavities", which can effectively curb the spread of flames and make the explosion pressure wave attenuate sharply. At the same time, the high specific surface area of ​​the material can absorb and conduct a large amount of heat energy, destroy the explosion conditions of the combustion medium, thereby reducing the flame combustion speed and ensuring the safe storage of the stored liquid. In addition, compared with other explosion suppression materials, the non-metallic explosion suppression ball 500 accounts for a relatively small proportion, only about 5% of the total volume of the storage warehouse, which can reduce the weight of the storage warehouse to a certain extent. When the cabin is in a full state, the explosion suppression ball 500 floats above the liquid. Due to the existence of the filter 400, the explosion suppression ball 500 will be restricted to the inside of the cabin where it is located, thereby reducing the contact area between the liquid and the air, reducing the proportion of volatiles in the cabin, and reducing the possibility of cabin explosion while increasing the quality of the stored materials.

[0032] Reference Figure 6 The storage reservoir shell and the partition 310 have the same cross-sectional structure, which is a double-layer structure with a gap inside. The gap is filled with a filling fluid 300. The filling fluid 300 is composed of shear-hardening glue, which is a non-Newtonian fluid. The main component is polyborosiloxane, which has strong fluidity and impact resistance. After being penetrated, due to the characteristics of the fluid, it can perform simple self-repair, which can effectively prevent further leakage of the internal liquid or minimize the leakage rate of the liquid. A self-sealing layer is also provided on the inner surface of the junction of the shell, the partition 310 and the filling fluid 300. The self-sealing layer can shrink and rebound to reduce the perforation area. At the same time, a small amount of storage material leaks inside the storage reservoir, which can fill the perforation to a certain extent, thereby achieving a self-sealing effect of the perforation.

[0033] Reference Figure 3 The bottoms of several outer sub-cabins in the outer cabin 200 are all provided with liquid outlets, which can realize simultaneous liquid discharge, increase liquid discharge efficiency, and cope with different emergencies.

[0034] Reference Figure 3 A liquid outlet tank 800 is provided below the liquid outlet provided at the bottom of the inner cabin 100 and the outer cabin 200. A liquid outlet is provided at the bottom of the liquid outlet tank 800 to collect the liquid in one place and then extract it uniformly, thereby increasing the efficiency of liquid extraction. A support column 900 is provided below the liquid outlet tank 800 to support the storage tank and adapt to different terrain environments.

[0035] Reference Figure 3A liquid inlet is provided on the top of each of the several outer sub-cabins in the outer cabin 200, which increases the feeding speed, improves the efficiency, and can adapt to extreme situations.

[0036] Reference Figure 7 , Figure 8 A protective cover 600 is arranged above the inner cabin 100 and the outer cabin 200, and the protective cover 600 includes a first protective cover 610 and a second protective cover 620. The diameter of the first protective cover 610 is larger than the diameter of the inner cabin 100, and the outer diameter of the second protective cover 620 is larger than the outer diameter of the outer cabin 200. The first protective cover 610 is arranged above the second protective cover 620. The first protective cover 610 and the second protective cover 620 can be fixed on the top surface of the inner cabin 100 and the outer cabin 200 through supporting legs. The outer diameter of the second protective cover 620 is larger than the outer diameter of the first protective cover 610, and an opening is arranged at the center of the second protective cover 620, and the opening diameter is smaller than the outer diameter of the first protective cover 610. The first protective cover 610 can slide rainwater from above directly onto the second protective cover 620, and can be replaced separately. After a long period of use, the first protective cover 610 is affected by the sun, wind, rain, etc., and it is the first to age. Replacement alone can effectively increase the service life of the storage library.

[0037] Reference Figure 7 , Figure 8 A multi-level joint protection storage warehouse also includes a liquid inlet pipe 700, which enters the opening in the center of the second protective cover 620 from the gap between the first protective cover 610 and the second protective cover 620. This design enables the position of the liquid inlet of the liquid inlet pipe 700 close to the top of the inner cabin 100 to be covered by the first protective cover 610, which protects the cleanliness of the storage warehouse to the maximum extent and prevents various impurities falling from the sky from entering the storage warehouse. In extreme cases, such as when the storage warehouse is hit by air, such as the falling of flying objects, it can also prevent the storage warehouse from being directly damaged. The first protective cover 610 can play a great protective role. The liquid inlet pipe 700 is divided into several branch pipes from the opening, which are respectively connected to the liquid inlets set above the inner cabin 100 and the outer cabin 200. The split design is linked with multiple liquid inlets to increase the liquid filling efficiency of the storage warehouse.

[0038] Reference Figure 7 , Figure 8 The liquid inlet pipe 700 is provided with several branch pipes on the outside of the storage bin. The branch pipes enter the gap between the first protective cover 610 and the second protective cover 620 from several directions. An opening is provided in the center of the second protective cover 620 to merge into one pipe. This root pipe is further divided into several branch pipes, which are respectively connected to the liquid inlets provided on the top of the inner cabin 100 and the outer cabin 200. This design enables the storage bin to have multiple liquid inlet channels. If one of them fails, the other pipes can operate directly, ensuring the stability of the work.

[0039] Reference Figure 3 The protective cover 600 also includes a third protective cover 630, which is arranged below the second protective cover 620 and above the inner cabin 100 and the outer cabin 200. The outer circle diameter of the third protective cover 630 is the same as the outer circle diameter of the third protective cover 630, and completely covers the upper surface of the inner cabin 100 and the outer cabin 200. The third protective cover 630 is provided with a groove for the liquid inlet pipe 700 to pass through. The third protective cover 630 fills the space on the top of the outer cabin 200, making the storage library structure more stable while enhancing the protection of the top of the storage library.

Claims

1. A multi-level joint protection storage library, characterized in that: The storage bin is arranged above the ground, with a liquid inlet at the top and a liquid outlet at the bottom. The storage bin is divided into an inner cabin (100) and an outer cabin (200) by a partition (310). The inner cabin (100) is provided with a liquid inlet at the top and a liquid outlet at the bottom. The outer chamber (200) is provided with a liquid outlet at the bottom. The interior of the inner cabin (100) is divided into a plurality of inner cabins by a plurality of horizontally arranged partitions (310), and a first liquid passage port (410) is arranged on the partition (310) between two adjacent inner cabins. The interior of the outer cabin (200) is divided into a plurality of outer cabins by a plurality of vertically arranged partitions (310), the vertical heights of the top surfaces of the plurality of outer cabins decreasing in sequence from the highest outer cabin to the outer cabin with the lowest top surface vertical height, a second liquid trough (420) is arranged on the partitions (310) between adjacent outer cabins, the horizontal position of the second liquid trough (420) is lower than the upper surface of the lower outer cabin, and the space between the two outer cabins with the largest top surface vertical height difference is in a closed state, A third liquid passage (430) is provided on the partition (310) between the inner compartment body with the highest vertical height and the outer compartment body with the highest top vertical height in the inner compartment body (100), and the third liquid passage (430) is at a vertical height lower than the upper surface of the outer compartment body.

2. A multi-level joint protection storage library according to claim 1, characterized in that: A plurality of explosion suppression balls (500) are respectively arranged in the plurality of inner sub-cabin bodies and the outer sub-cabin bodies, and a filter screen (400) matching the shape thereof is arranged on the first liquid passage port (410), the second liquid passage port (420), the third liquid passage port (430), the liquid inlet port, and the liquid outlet port, wherein the aperture of the filter screen (400) is smaller than the diameter of the explosion suppression ball (500).

3. A multi-level joint protection storage library according to claim 1, characterized in that: The storage reservoir shell and the partition (310) have the same cross-sectional structure and are a double-layer structure, with a gap provided inside, and the gap is filled with a filling fluid (300). A self-sealing layer is also provided on the inner surface where the shell, the partition (310) and the filling fluid (300) meet.

4. A multi-level joint protection storage library according to claim 1, characterized in that: The bottoms of the plurality of outer sub-cabins in the outer cabin (200) are all provided with liquid outlets.

5. A multi-level joint protection storage library according to claim 4, characterized in that: A liquid outlet tank (800) is arranged below the liquid outlet arranged at the bottom of the inner cabin body (100) and the outer cabin body (200), a liquid outlet is arranged at the bottom of the liquid outlet tank (800), and a support column (900) is arranged below the liquid outlet tank (800).

6. A multi-level joint protection storage library according to claim 1, characterized in that: A liquid inlet is provided on the top of each of the plurality of outer sub-cabin bodies in the outer cabin body (200).

7. A multi-level joint protection storage library according to claim 6, characterized in that: A protective cover (600) is provided above the inner cabin (100) and the outer cabin (200). The protective cover (600) comprises a first protective cover (610) and a second protective cover (620); the diameter of the first protective cover (610) is greater than the diameter of the inner cabin (100); the outer diameter of the second protective cover (620) is greater than the outer diameter of the outer cabin (200); The first protective cover (610) is arranged above the second protective cover (620), the outer diameter of the second protective cover (620) is larger than the outer diameter of the first protective cover (610), and an opening is arranged at the center of the second protective cover (620), the diameter of the opening is smaller than the outer diameter of the first protective cover (610).

8. A multi-level joint protection storage library according to claim 7, characterized in that: It also includes a liquid inlet pipe (700), The liquid inlet pipe (700) enters the opening at the center of the second protective cover (620) from the gap between the first protective cover (610) and the second protective cover (620), and is divided into a plurality of branch pipes from the opening, which are respectively connected to the liquid inlets arranged above the inner cabin (100) and the outer cabin (200).

9. A multi-level joint protection storage library according to claim 8, characterized in that: The liquid inlet pipe (700) is provided with a plurality of branch pipes on the outside of the storage bin, and the branch pipes enter the gap between the first protective cover (610) and the second protective cover (620) from a plurality of directions. An opening is provided at the center of the second protective cover (620) to merge into a pipe, and this pipe is further divided into a plurality of branch pipes, which are respectively connected to the liquid inlets provided above the inner cabin (100) and the outer cabin (200).

10. A multi-level joint protection storage library according to claim 9, characterized in that: The protective cover (600) further comprises a third protective cover (630), which is arranged below the second protective cover (620) and above the inner cabin body (100) and the outer cabin body (200), and has an outer ring diameter that is the same as the outer ring diameter of the third protective cover (630) and completely covers the upper surfaces of the inner cabin body (100) and the outer cabin body (200), and the third protective cover (630) is provided with a slot for the liquid inlet pipe (700) to pass through.

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