Chopping knife

Abstract

The chopper comprises a cylinder component, a cone component and an anti-loosening assembly, and the cone component and the cylinder component are connected through a stud; the anti-loosening assembly is located between the cylinder component and the cone component and comprises two gaskets arranged on the stud in a sleeving mode, the end faces, close to each other, of the two gaskets are clamped through a plurality of first tooth-shaped structures, and the other end faces of the gaskets abut against the cone component or the cylinder component through a plurality of second tooth-shaped structures. When the cone component and the cylinder component are locked and connected through the stud, the cone component and the cylinder component press the two gaskets of the anti-loosening assembly, the gaskets clamp the end face of the cone component or the end face of the cylinder component through the second tooth-shaped structures, the two gaskets are clamped in an engaged mode through the first tooth-shaped structures, and the first tooth-shaped structures can prevent the two gaskets from rotating relatively. The second tooth-shaped structure can prevent the cone component or the cylinder component from rotating, and therefore looseness prevention is achieved. The method can be widely applied to the technical field of integrated circuit production.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of integrated circuit production, in particular to a cleaving knife. BACKGROUND

[0002] In the production process of semiconductor integrated circuits, it is usually necessary to connect the soldering area of a semiconductor bare chip with the I / O lead or the metal wiring soldering area on the substrate of a microelectronic package by using a metal filament (soldering wire). The cleaving knife is used as a tool for soldering. When packaging, the extremely thin metal wire is inserted through the cleaving knife, and then the lead bonding of the semiconductor chip is completed by using the hot ultrasonic bonding method, that is, the extremely thin metal wire is used to package one chip onto another chip or substrate.

[0003] At present, there are various types of cleaving knives on the market, but most of them adopt an integrated structure design. Although the overall structure is simple, the wear rate of the wire outlet at the bottom end of the traditional cleaving knife is high. After a certain number of bonding and packaging, the entire cleaving knife needs to be replaced, which not only wastes resources but also is not conducive to reducing production and processing costs. However, if the cleaving knife is designed as a split type detachable structure, the knife head will have the problem of easy loosening and falling off. CONTENT OF THE INVENTION

[0004] To solve at least one of the above technical problems, the present application provides a cleaving knife, which adopts the following technical scheme.

[0005] The cleaving knife provided by the present application comprises a cylindrical component, a conical component and an anti-loosening assembly. The conical component is connected with the cylindrical component through a stud. The anti-loosening assembly is located between the cylindrical component and the conical component. The anti-loosening assembly comprises two gaskets sleeved on the stud. The end faces of the two gaskets close to each other are clamped by a plurality of first tooth-shaped structures. The other end faces of the gaskets abut against the conical component or the cylindrical component by a plurality of second tooth-shaped structures.

[0006] The cleaving knife has at least the following beneficial effects: when the conical component and the cylindrical component are locked and connected through the stud, the conical component and the cylindrical component press the two gaskets of the anti-loosening assembly. The gaskets clamp the end faces of the conical component or the cylindrical component by the second tooth-shaped structures, and the two gaskets are clamped by the first tooth-shaped structure. When the conical component and the cylindrical component tend to rotate and loosen, the first tooth-shaped structure can prevent the two gaskets from rotating relative to each other, and the second tooth-shaped structure can prevent the conical component or the cylindrical component from rotating, thereby achieving anti-loosening. The present application can be widely applied to the technical field of integrated circuit production.

[0007] In some embodiments of the present application, the first tooth surface has a first tooth surface and a second tooth surface, and the mutual abutment of the second tooth surface between the two spacers achieves self-locking and anti-loosening. With respect to a plane perpendicular to the length direction axis of the wedge, the inclination angle of the first tooth surface is A, and A > B, where B is the thread angle of the stud.

[0008] In some embodiments of the present application, with respect to a plane perpendicular to the length direction axis of the wedge, the angle of the second tooth surface is C, and C > A.

[0009] In some embodiments of the present application, the second tooth surface has a third tooth surface and a fourth tooth surface, and the fourth tooth surface exerts resistance on the conical component or the cylindrical component when the conical component or the cylindrical component is loosened.

[0010] In some embodiments of the present application, with respect to a plane perpendicular to the length direction axis of the wedge, the inclination angle of the third tooth surface is D, and the angle of the fourth tooth surface is E, and E > D.

[0011] In some embodiments of the present application, the thickness of the spacer is L1, and 0.5 mm ≤ L1 ≤ 0.505 mm.

[0012] In some embodiments of the present application, the outer radius of the spacer is R1, and 1.583 mm ≤ R1 ≤ 1.586 mm.

[0013] In some embodiments of the present application, one end of the cylindrical component is provided with a threaded hole, and the stud is integrally formed with the conical component.

[0014] In some embodiments of the present application, one end of the conical component is provided with a threaded hole, and the stud is integrally formed with the cylindrical component.

[0015] In some embodiments of the present application, one end of the conical component is provided with a threaded hole, and one end of the cylindrical component is provided with a threaded hole.

[0016] The wedge provided by the present application comprises a cylindrical component, a conical component and an anti-loosening assembly. The conical component is connected with the cylindrical component through a stud. The anti-loosening assembly is located between the cylindrical component and the conical component. The anti-loosening assembly comprises two first spacers and at least one second spacer. The first spacer and the second spacer are sleeved on the stud. The second spacer is located between the two first spacers. The end surface of the first spacer towards the second spacer is provided with a plurality of first tooth structures. The other end surface of the first spacer is provided with a plurality of second tooth structures. Both end surfaces of the second spacer are provided with a plurality of first tooth structures.

[0017] The application has at least the following beneficial effects: in the wedge, when the conical part and the cylindrical part are connected by the stud locking, the conical part and the cylindrical part press the first gasket and the second gasket of the anti-loose assembly, the first gasket clamps the end face of the conical part or the cylindrical part with the second tooth structure, and the first gasket and the second gasket are clamped with the first tooth structure, when the conical part and the cylindrical part appear the tendency of rotating loose, the first tooth structure can prevent the relative rotation of the first gasket and the second gasket, and the second tooth structure can prevent the conical part or the cylindrical part from rotating, so as to realize anti-loose. The application can be widely applied to the field of integrated circuit production technology.

[0018] In some embodiments of the application, the first tooth structure has a first tooth surface and a second tooth surface, the end face of the first gasket and the end face of the second gasket are self-locked and anti-loose by mutual abutment of the second tooth surfaces, and the inclination angle of the first tooth surface is A with respect to the plane perpendicular to the length direction axis of the wedge, and A > B, wherein B is the thread angle of the stud.

[0019] Additional aspects and advantages of the application will be described in part in the description that follows, and in part will become apparent to those skilled in the art upon examination of the following description or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0020] The application will be further described below in conjunction with the drawings and examples. It should be noted that the examples embodied in the following drawings are exemplary and are only used to explain the application, and cannot be understood as a limitation on the application.

[0021] Fig. 1 It is a structure diagram of the wedge.

[0022] Fig. 2 It is a structure diagram of the wedge.

[0023] Fig. 3 It is a structure diagram of the gasket.

[0024] Fig. 4 It is a structure diagram of the gasket.

[0025] Reference signs: cylindrical part 110; conical part 120; gasket 200; first tooth structure 210; second tooth structure 220; first tooth surface 221; second tooth surface 222; third tooth surface 223; fourth tooth surface 224. DETAILED DESCRIPTION

[0026] The following will be described in conjunction with Figs. 1 to 4 The embodiments of the application are described in detail below, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The examples described below by reference to the drawings are exemplary and are only used to explain the application, and cannot be understood as a limitation on the application.

[0027] In the description of the present application, it needs to be understood that, if the terms "center", "middle", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0028] In the description of the present application, if the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, within, etc. are understood as including the number. If it is described that the first, second is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implying the number of the indicated technical features or the sequence of the indicated technical features.

[0029] In the description of the present application, unless otherwise explicitly specified and limited, the terms "set", "mount", "connected", "connected" should be understood broadly, for example: it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] In the description of the present application, if the description of the terms "one embodiment", "some embodiments", "one example", "some examples", "some embodiments", "illustrative embodiments", "example", "specific example", "some examples" and the like means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0031] The application relates to a wedge, which comprises a column part 110 and a cone part 120, the cone part 120 is connected with the column part 110 through a stud, the column part 110 is a handle of the wedge, and the cone part 120 has a tip head of the wedge. Further, the wedge comprises an anti-loosening assembly, the anti-loosening assembly is sleeved on the stud, the anti-loosening assembly is located between the column part 110 and the cone part 120, and the anti-loosening assembly is used for preventing the cone part 120 from loosening from the column part 110.

[0032] Specifically, the anti-loosening assembly comprises two washers 200 sleeved on the stud, the washers 200 are provided with central through holes, the two washers 200 are arranged in a stack mode, and the two washers 200 are close to each other, one of the washers 200 is close to the column part 110, and the other washer 200 is close to the cone part 120.

[0033] Further, an end face of one end of the washer 200 is provided with a plurality of first tooth-shaped structures 210, and the plurality of first tooth-shaped structures 210 are formed in a tooth disc shape on the end face of the washer 200. An end face of the other end of the washer 200 is provided with a plurality of second tooth-shaped structures 220, and the plurality of second tooth-shaped structures 220 are formed in a tooth disc shape on the end face of the washer 200.

[0034] The plurality of first tooth-shaped structures 210 are clamped between the end faces of the two washers 200 close to each other, the friction and the engagement force are increased, the relative rotation between the two washers 200 is prevented, and the self-locking of the anti-loosening assembly is realized. The plurality of second tooth-shaped structures 220 on the other end face of the washer 200 abut against the cone part 120 or the column part 110, the relative rotation between the cone part 120 and the washer 200 or between the column part 110 and the washer 200 is prevented, and the anti-loosening between the column part 110 and the cone part 120 is realized.

[0035] When the column part 110 and the cone part 120 are locked through the stud, the two washers 200 of the anti-loosening assembly are pressed tightly between the column part 110 and the cone part 120. In this case, the first tooth-shaped structures 210 are clamped and engaged with each other between the two washers 200. The washer 200 close to the column part 110 presses the end face of the column part 110 through the second tooth-shaped structures 220, and the second tooth-shaped structures 220 have the clamping effect on the end face of the column part 110. Correspondingly, the washer 200 close to the cone part 120 presses the end face of the cone part 120 through the second tooth-shaped structures 220, and the second tooth-shaped structures 220 have the clamping effect on the end face of the cone part 120.

[0036] It can be understood that the first tooth structure 210 has a first tooth surface 221 and a second tooth surface 222. At least one of the first tooth surface 221 and the second tooth surface 222 is arranged obliquely, thereby forming the first tooth structure 210. Further, the mutual abutment of the second tooth surface 222 between the two gaskets 200 achieves self-locking and anti-loosening. Specifically, when the cone part 120 or the column part 110 has a tendency to rotate loose, the first tooth structure 210 between the two gaskets 200 abuts against each other with the second tooth surface 222, so that the two gaskets 200 cannot rotate, thereby achieving self-locking and anti-loosening.

[0037] On the gasket 200 for clamping the column part 110, the orientation of the second tooth surface 222 of the first tooth structure 210 is the same as the direction of tightening the column part 110 relative to the cone part 120. On the gasket 200 for clamping the cone part 120, the orientation of the second tooth surface 222 of the first tooth structure 210 is the same as the direction of tightening the cone part 120 relative to the column part 110. In this case, when the cone part 120, the column part 110 and the stud are tightened, the second tooth surface 222 of the first tooth structure 210 between the two gaskets 200 can gradually engage and clamp.

[0038] It should be noted that, with the plane perpendicular to the axis of the length direction of the wedge as the reference, the first tooth surface 221 is arranged obliquely, and the oblique angle of the first tooth surface 221 is A. Further, A > B is satisfied, where B is the thread angle of the stud. This case can be regarded as that the angle of the first tooth structure 210 on the gasket 200 is greater than the thread angle of the stud, and the linear displacement generated by one turn of the thread of the stud in the axial direction of the length direction of the wedge is less than the maximum linear displacement when the two gaskets 200 close to each other rotate relatively.

[0039] It can be understood that the addendum height of the first tooth structure 210 is greater than or equal to the pitch of the stud. Specifically, the addendum height of the first tooth structure 210 is in the range of [0.15mm, 0.2mm], and the pitch of the stud is in the range of [0.1mm, 0.15mm].

[0040] When the cylindrical component 110 or the conical component 120 is vibrated loose, since one of the gaskets 200 is clamped with the second toothed structure 220 to the cylindrical component 110 and the other gasket 200 is clamped with the second toothed structure 220 to the conical component 120, the cylindrical component 110 or the conical component 120 applies a torque to the corresponding gasket 200. On the one hand, the first toothed structure 210 between the two gaskets 200 is clamped with each other. On the other hand, due to the compression of the cylindrical component 110 and the conical component 120 to the two gaskets 200, the two gaskets 200 still keep close to each other, and the linear displacement of the cylindrical component 110 or the conical component 120 per rotation is less than the maximum linear displacement when the two gaskets 200 rotate relative to each other, and the linear displacement of the cylindrical component 110 or the conical component 120 is not enough to meet the requirement of the maximum linear displacement when the two gaskets 200 rotate relative to each other. Therefore, even if the gasket 200 is subjected to a torque, the two gaskets 200 cannot rotate relative to each other, and the gasket 200 can further press the end faces of the cylindrical component 110 and the conical component 120, thereby achieving anti-loose and self-locking.

[0041] In some examples, 30°≤A≤45° and 5°≤A-B≤8° to improve the self-locking ability and be more suitable for high-vibration environments.

[0042] In some embodiments, the first toothed structure 210 of the gasket 200 is provided as a one-way toothed structure to enhance the self-locking and anti-loose effect of the gasket 200.

[0043] Specifically, with respect to a plane perpendicular to the axis of the length direction of the chopper, the angle of the second tooth surface 222 is C, which satisfies C>A. In this case, the second tooth surface 222 is steeper than the first tooth surface 221, and the first toothed structure 210 is formed in a zigzag shape or a wedge tooth shape.

[0044] In some examples, 0<C≤90°. It can be understood that the second tooth surface 222 can be arranged obliquely or vertically.

[0045] In some examples, 20°≤C-A≤60°. If C-A is less than 20°, the inclination of the second tooth surface 222 is too large, which is not conducive to the self-locking between the two gaskets 200. If C-A is greater than 60°, the first tooth surface 221 is steeper than the second tooth surface 222, and the self-locking effect between the two gaskets is poor.

[0046] In some embodiments, the second tooth structure 220 has a third tooth surface 223 and a fourth tooth surface 224. At least one of the third tooth surface 223 and the fourth tooth surface 224 is arranged obliquely, thereby forming the second tooth structure 220. Compared with the first tooth structure 210, the second tooth structure 220 is arranged as a thin tooth, which helps to enhance the force of the second tooth structure 220 on the end of the column component 110 or the cone component 120.

[0047] Further, when the cone component 120 or the column component 110 is loosened, the fourth tooth surface 224 exerts a resistance on the cone component 120 or the column component 110, thereby playing a role of anti-loosening.

[0048] It should be noted that, with reference to a plane perpendicular to the axis of the length direction of the wedge, the third tooth surface 223 is arranged obliquely, and the oblique angle of the third tooth surface 223 is D, and the angle of the fourth tooth surface 224 is E.

[0049] In some examples, E>D is satisfied. In this case, the fourth tooth surface 224 is steeper than the third tooth surface 223, and the second tooth structure 220 is formed in a sawtooth shape or a wedge tooth shape.

[0050] In some examples, 0<E≤90° is satisfied. It can be understood that the fourth tooth surface 224 can be arranged obliquely or vertically.

[0051] In some examples, 25°≤E-D≤60° is satisfied. If E-D is less than 25°, the protrusion of the second tooth structure 220 is too long, the contact area with the column component 110 or the cone component 120 is too small, the pressure is too large, and the surface of the column component 110 or the cone component 120 is easily scratched. If E-D is greater than 60°, the protrusion of the second tooth structure 220 is too small, and the friction is small, which is not conducive to engagement and locking.

[0052] In some embodiments, the thickness of the gasket 200 is L1, and 0.5mm≤L1≤0.505mm is satisfied. The accuracy of the wedge is ensured, and the ultrasonic transmission efficiency during operation is avoided.

[0053] In some embodiments, the outer radius of the gasket 200 is R1, and 1.583mm≤R1≤1.586mm is satisfied. The accuracy of the wedge is ensured, and the ultrasonic transmission efficiency during operation is avoided.

[0054] In some embodiments, one end of the column component 110 is provided with a threaded hole, the threaded hole is formed along the central axis in the length direction of the column component 110, the threaded hole is integrally formed with the cone component 120, and the threaded hole is located at the end of the cone component 120.

[0055] It can be understood that the threaded hole is threadedly connected with the inner wall of the threaded hole, thereby realizing the connection of the cone component 120 and the column component 110.

[0056] In some examples, the length of the cylindrical component 110 ranges from [6.11mm, 6.12mm], the depth of the threaded hole ranges from [1mm, 1.05mm], the inner diameter ranges from [0.75mm, 0.8mm] and the outer diameter ranges from [0.9mm, 1.4mm].

[0057] In some examples, the length of the conical component 120, including the stud, ranges from [6mm, 6.05mm] and the outer diameter of the stud ranges from [0.9mm, 1.4mm].

[0058] In some examples, the outer sidewall of the cylindrical component 110 is provided with a flat surface to facilitate the clamping of the cylindrical component 110 by a wrench.

[0059] In some examples, the outer sidewall of the conical component 120 is provided with a flat surface to facilitate the clamping of the conical component 120 by a wrench.

[0060] In addition to the above, there are at least the following alternative embodiments regarding the structure of the cylindrical component 110, the stud and the conical component 120.

[0061] In some alternative embodiments, the conical component 120 is provided with a threaded hole at one end, the threaded hole is formed along the central axis in the length direction of the conical component 120, the stud is integrally formed with the cylindrical component 110, and the stud is located at the end of the cylindrical component 110.

[0062] In another alternative embodiment, the conical component 120 is provided with a threaded hole at one end, the cylindrical component 110 is provided with a threaded hole at one end, and the two ends of the stud are threadedly connected with the inner walls of the threaded holes of the conical component 120 and the cylindrical component 110, respectively.

[0063] Based on the above introduction of the wedge structure, the anti-loose assembly has the following alternative embodiments.

[0064] As an alternative embodiment, the anti-loose assembly comprises a first washer and a second washer, the first washer is provided in two, the second washer is provided in at least one, the first washer and the second washer are both provided with a central through hole, the first washer and the second washer are both sleeved on the stud, and the second washer is located between the two first washers.

[0065] It can be understood that when the conical component and the cylindrical component are locked and connected by the stud, the first washer and the second washer are pressed between the cylindrical component and the conical component.

[0066] Further, the end face of the first gasket facing the second gasket is provided with a plurality of first toothed structures, the other end face of the first gasket is provided with a plurality of second toothed structures, and both end faces of the second gasket are provided with a plurality of first toothed structures. The end face of the first gasket is engaged and clamped with the second gasket by the first toothed structure, and the other end face of the first gasket is abutted with the conical part or the cylindrical part by the second toothed structure.

[0067] It should be noted that the first toothed structure has a first tooth surface and a second tooth surface, and the end face of the first gasket and the end face of the second gasket are self-locked and anti-loose by the mutual abutment of the second tooth surfaces.

[0068] In some examples, the second gasket is provided as one. In this case, at the two end faces of the second gasket, the second gasket is abutted with the corresponding first toothed structure of the first gasket by the second tooth surface of the first toothed structure.

[0069] In other examples, the second gasket is provided as at least two. In this case, the adjacent first gasket and the second gasket are abutted with each other by the second tooth surface of the first toothed structure, and the adjacent second gaskets are abutted with each other by the second tooth surface of the first toothed structure.

[0070] It should be noted that more designs of the first toothed structure and the second toothed structure are as described above.

[0071] The embodiments of the present application are described in detail above with reference to the drawings, but the present application is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the present application. In addition, the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

Claims

1. A wedge, characterized by: The utility model provides a kind of wedge, including Cylindrical component; Conical component, which is connected with the cylindrical component by stud; Anti-loose assembly, which is located between the cylindrical component and the conical component, includes two washers sleeved on the stud, and the end faces of the two washers close to each other are engaged with a plurality of first tooth structures, and the other end faces of the washers abut against the conical component or the cylindrical component with a plurality of second tooth structures.

2. The wedge of claim 1, wherein: The first tooth structure has a first tooth surface and a second tooth surface, and the mutual abutment of the second tooth surfaces between the two washers achieves self-locking and anti-loosening, and with respect to a plane perpendicular to the axis of the length direction of the wedge, the inclination angle of the first tooth surface is A, which satisfies A>B, where B is the thread angle of the stud.

3. The wedge of claim 2, wherein: With respect to the plane perpendicular to the axis of the length direction of the wedge, the angle of the second tooth surface is C, which satisfies C>A.

4. The wedge of any one of claims 1 to 3, wherein: The second tooth structure has a third tooth surface and a fourth tooth surface, and when the conical component or the cylindrical component is loosened, the fourth tooth surface exerts resistance on the conical component or the cylindrical component.

5. The wedge of claim 4, wherein: With respect to the plane perpendicular to the axis of the length direction of the wedge, the inclination angle of the third tooth surface is D, and the angle of the fourth tooth surface is E, which satisfies E>D.

6. The wedge of claim 1, wherein: The thickness of the washer is L1, which satisfies 0.5mm≤L1≤0.505mm.

7. The wedge of claim 1 or 6, wherein: The outer radius of the washer is R1, which satisfies 1.583mm≤R1≤1.586mm.

8. The wedge of claim 1, wherein: One end of the cylindrical component is provided with a threaded hole, and the stud is integrally formed with the conical component; or one end of the conical component is provided with a threaded hole, and the stud is integrally formed with the cylindrical component; or one end of the conical component is provided with a threaded hole, and one end of the cylindrical component is provided with a threaded hole.

9. A wedge, characterized by: The utility model provides a kind of wedge, including Cylindrical component; Conical component, which is connected with the cylindrical component by stud; Anti-loose assembly, which is located between the cylindrical component and the conical component, includes two first washers and at least one second washer, the first washers and the second washer are sleeved on the stud, the second washer is located between the two first washers, the end face of the first washer towards the second washer is provided with a plurality of first tooth structures, the other end face of the first washer is provided with a plurality of second tooth structures, and both end faces of the second washer are provided with a plurality of first tooth structures.

10. The wedge of claim 9, wherein: The first tooth structure has a first tooth surface and a second tooth surface, and the end faces of the first washer and the end faces of the second washer are mutually abutted by the second tooth surfaces to achieve self-locking and anti-loosening, and with respect to a plane perpendicular to the axis of the length direction of the wedge, the inclination angle of the first tooth surface is A, which satisfies A>B, where B is the thread angle of the stud. The first tooth structure has a first tooth surface and a second tooth surface, and the end faces of the first washer and the end faces of the second washer are mutually abutted by the second tooth surfaces to achieve self-locking and anti-loosening, and with respect to a plane perpendicular to the axis of the length direction of the wedge, the inclination angle of the first tooth surface is A, which satisfies A>B, where B is the thread angle of the stud.

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