CN215340937U - Server multilayer PCIE module fixing device - Google Patents

Abstract

The multi-layer PCIE module fixing device of the server comprises a bracket, wherein an opening for inserting a PCIE module or an sata board card is formed in the bracket; the bracket at one end of the opening is rotatably connected with a rotating buckle, an I-shaped nail matched with the rotating buckle is fixedly arranged on the bracket, and the rotating buckle is buckled with the I-shaped nail and used for fixing the PCIE module or is separated from the I-shaped nail and used for disassembling the PCIE module; a limiting clamping jaw is fixedly arranged on the outer side of the bracket at the other end of the opening; a plurality of clamping grooves are formed in the inner side of the bracket at the other end of the opening, each PCIE module is fixedly provided with a clamping plate, and one end of each clamping plate is connected with the clamping groove in a pluggable mode; when the PCIE module is inserted into the bracket, the limiting clamping jaw limits the clamping plate from the end part of the clamping plate. The multi-layer PCIE module fixing device for the server can conveniently and quickly disassemble and assemble the PCIE module.

Description

Server multilayer PCIE module fixing device

Technical Field

The application relates to the field of server structural members, in particular to a server multilayer PCIE module fixing device.

Background

The PICE module is a necessary component unit of the server, and the server can be connected with various hardware through the PCIE module.

In the prior art, a PCIE module is generally fixed in a server chassis through a connection piece and a bolt. PCIE module test, server equipment are carried out in the product production stage to and use the maintenance stage to tear the machine and maintain the in-process and need carry out frequent dismantlement to the PCIE module at the product, need operate inconveniently with the help of instrument such as screwdriver, pass through the bolt fastening moreover, if the problem that the user's dismouting in-process is improper hard to cause smooth silk, bolt live time is met the tide for a long time and is rusted and lead to dismantling difficulty scheduling problem. Even when a plurality of PCIE modules are stacked and fixed in multiple layers, the dismounting structures between the relevant PCIE modules and the irrelevant PCIE modules affect each other, and sometimes the relevant PCIE modules can be dismounted only by dismounting the irrelevant PCIE modules first.

Therefore, the way of fixing the PCIE module in the server by using the bolt has much inconvenience in the using process.

SUMMERY OF THE UTILITY MODEL

To solve the above technical problem or at least partially solve the above technical problem, the present application provides a server multi-layer PCIE module fixing apparatus, including a bracket, wherein,

an opening for inserting the PCIE module or the sata board card is formed in the bracket;

the bracket at one end of the opening is rotatably connected with a rotating buckle, an I-shaped nail matched with the rotating buckle is fixedly arranged on the bracket, and the rotating buckle is buckled with the I-shaped nail and used for fixing the PCIE module or is separated from the I-shaped nail and used for disassembling the PCIE module;

a limiting clamping jaw is fixedly arranged on the outer side of the bracket at the other end of the opening;

a plurality of clamping grooves are formed in the inner side of the bracket at the other end of the opening, each PCIE module is fixedly provided with a clamping plate, and one end of each clamping plate is connected with the clamping groove in a pluggable mode;

when the PCIE module is inserted into the bracket, the limiting clamping jaw limits the clamping plate from the end part of the clamping plate.

Furthermore, the bracket comprises a first plate body, wherein a second plate body, a third plate body and a fourth plate body are arranged along a group of long sides and two groups of short sides of the first plate body respectively, the second plate body, the third plate body and the fourth plate body are perpendicular to the first plate body, and two ends of the second plate body are connected with the third plate body and the fourth plate body respectively.

Furthermore, a plurality of EMI elastic sheets are fixedly arranged on the first plate body, a Riser module connecting plate is fixedly arranged on the first plate body, and the Riser module connecting plate is used for being connected with a Riser module.

Furthermore, the second board body is opposite to the opening, the Riser card is fixedly arranged on the inner side of the second board body, and the Riser card is connected with the PCIE module and the sata board card through an interface.

Furthermore, be provided with the slotted hole that holds PCIE module IO interface and sata integrated circuit board IO interface and pass on the third plate body, the fixed pivot that sets up in the third plate body, rotate in the pivot and connect rotatory buckle, the fixed cooperation that sets up on the third integrated circuit board the I-shaped nail of rotatory buckle.

Furthermore, the rotary buckle comprises a buckle main body with a cross section of a shape of '21274', wherein two ends of the buckle main body are oppositely provided with rotating shaft connecting holes, a buckle button is movably arranged in the buckle main body, a notch capable of being inserted into the groove in the I-shaped nail is arranged on the buckle button, and a plurality of clamping claws for limiting the PCIE module are arranged on the buckle main body.

Furthermore, a pair of sliding rods is fixedly arranged in the buckle main body, a first spring is sleeved outside each sliding rod, a screw for limiting the first spring is fixedly arranged at the end of each sliding rod, and the buckle button is arranged on the two sliding rods in a sliding mode.

Furthermore, the outer side of the fourth plate body is fixedly provided with the limiting clamping jaw, the limiting clamping jaw comprises a fixing part and a plurality of elastic clamping jaws connected to the fixing part, and the fixing part is fixed outside the fourth plate body through a connecting piece.

Furthermore, the limiting clamping jaw is provided with a fixing clamp for fixing the bracket, the fixing clamp comprises a first clamp body connected with the limiting clamping jaw, the first clamp body is connected with a second clamp body in a sliding mode, a second spring is arranged between the second clamp body and the limiting clamping jaw, and a clamping portion is formed between the first clamp body and the second clamp body.

Furthermore, the second plate body is provided with heat dissipation holes.

Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:

the method comprises the steps that a tray fixing sata board card and a PCIE module are connected with a Riser card, and the position of the PCIE module inserted into the tray is limited through the matching of a card slot fixedly arranged on the tray and a board on the PCIE module and the matching of a slot hole on the tray and an IO interface of the PCIE module; and through set up in bracket one end spacing clamping jaw with rotate connect in the bracket other end rotatory buckle cooperation locking PCIE module in the bracket. When the user controls the rotary buckle to loosen the PCIE module, the user manually pushes the buckle button to enable the buckle button to slide along the sliding rod, the notch on the buckle button is separated from the groove on the I-shaped nail, and the rotary buckle can wind the rotating shaft to rotate. When the user controls the rotary buckle to fasten the PCIE module, the user pushes the rotary buckle to the I-shaped nail, and the notch penetrates through the I-shaped nail and is clamped in the groove of the I-shaped nail under the action of the first spring, so that the clamping jaw abuts against the side wall of the PCIE module to lock the PCIE module in the bracket. Easy operation, control are convenient, and carrying out the PCIE module and dismantling the in-process, easy operation, and adopt this application not to use any bolt to fix the PCIE module, need not to consider the problem of taboo bolt slick silk, corrosion, and when fixing multiunit PCIE module, the dismouting process mutual independence of PCIE module. In addition connect the Riser module connecting plate on the bracket, it is convenient the Riser module is connected to the bracket, the fixation clamp that sets up on the spacing clamping jaw is convenient to be connected bracket and server machine incasement portion mechanism.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the utility model and together with the description, serve to explain the principles of the utility model.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

Fig. 1 is a structural diagram of a side of a fixing device for a multi-layer PCIE module of a server according to an embodiment of the present application;

fig. 2 is a structural diagram of another side of a server multi-layer PCIE module fixing apparatus according to an embodiment of the present application;

FIG. 3 is a side view of the bracket according to an embodiment of the present disclosure;

FIG. 4 is a partial structural view of an end of a bracket according to an embodiment of the present disclosure;

FIG. 5 is a structural view of the other side of the bracket according to the embodiment of the present disclosure;

fig. 6 is a structural diagram of a rotating buckle provided in the embodiment of the present application;

FIG. 7 is a cross-sectional view of the rotating clasp shown in FIG. 6;

FIG. 8 is a block diagram of a spacing clamping jaw and one side of a fixing clamp provided by the embodiment of the application;

FIG. 9 is a block diagram of the other side of the retaining clip and the retaining clip according to an embodiment of the present disclosure;

fig. 10 is a schematic front view of a Riser card provided in an embodiment of the present application;

fig. 11 is a schematic diagram of the back of a Riser card provided in an embodiment of the present application;

fig. 12 is a schematic diagram of a PCIE module provided in the embodiment of the present application.

The reference numbers and meanings in the drawings are as follows:

1. bracket, 11, louvre, 12, EMI shell fragment, 13, the pivot, 14, I nail, 15, slotted hole, 16, the draw-in groove, 2, spacing clamping jaw, 21, the fixation clamp, 211, first clamp, 212, the second clamp, 213, the second spring, 3, the Riser card, 4, Riser module connecting plate, 5, sata integrated circuit board, 6, PCIE module, 61, the cardboard, 7, rotatory buckle, 71, the buckle main part, 72, buckle button, 73, the slide bar, 74, the notch, 75, pivot connecting hole, 76, screw, 77, first spring, 78, the jack catch.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The present application is described in detail below with reference to the accompanying drawings, wherein fig. 1 is a structural diagram of a side of a server multilayer PCIE module fixing apparatus provided in an embodiment of the present application; fig. 2 is a structural diagram of another side of a server multi-layer PCIE module fixing apparatus according to an embodiment of the present application;

FIG. 3 is a side view of the bracket according to an embodiment of the present disclosure; FIG. 4 is a partial structural view of an end of a bracket according to an embodiment of the present disclosure; FIG. 5 is a structural view of the other side of the bracket according to the embodiment of the present disclosure; fig. 6 is a structural diagram of a rotating buckle provided in the embodiment of the present application; FIG. 7 is a cross-sectional view of the rotating clasp shown in FIG. 6; FIG. 8 is a block diagram of a spacing clamping jaw and one side of a fixing clamp provided by the embodiment of the application; FIG. 9 is a block diagram of the other side of the retaining clip and the retaining clip according to an embodiment of the present disclosure; fig. 10 is a schematic front view of a Riser card provided in an embodiment of the present application; fig. 11 is a schematic diagram of the back of a Riser card provided in an embodiment of the present application; fig. 12 is a schematic diagram of a PCIE module provided in the embodiment of the present application.

With reference to fig. 1 and fig. 2, the application provides a server multilayer PCIE module fixing device, which can combine a multilayer PCIE module, a sata board card, and a Riser card together through the cooperation of the bracket 1, the limiting clamping jaw 2, and the rotating buckle 7.

Specifically, the multilayer PCIE module fixing device of server that this application provided includes bracket 1, and wherein, it is shown with figure 3 and figure 5 to combine to refer to, bracket 1 includes first plate body, follows a set of long limit of first plate body and two sets of minor faces set up second plate body, third plate body and fourth plate body respectively, second plate body, third plate body and fourth plate body perpendicular to first plate body, the both ends of second plate body are connected respectively third plate body and fourth plate body, the third plate body with the fourth plate body sets up relatively, first plate body, second plate body, third plate body and fourth plate body constitute and partly enclose bracket 1.

The three EMI elastic sheets 12 are arranged at one end, close to the third plate, of the first plate, the first plate is connected with a Riser module connecting plate 4 in a riveting mode, a connecting hole is formed in the Riser module connecting plate 4, and the connecting hole is used for being connected with a Riser module.

The second plate body is followed the long limit of first plate body sets up, the inboard fixed setting of second plate body Riser card 3 combines to refer to and reads 10 and 11 shown, one side of Riser card 3 sets up three interface, the edge of Riser card 3 sets up the receptacle interface and the golden finger of 72 pins, Riser card 3 is fixed in during the second plate body, make threely the interface orientation the second plate body is inboard, just 72 receptacle interface and golden finger orientation on the Riser card 3 the outside of bracket 1. The Riser card 3 is connected with the PCIE module 6 and the sata board card 5 which are inserted in the bracket 1 through the interface.

Be provided with on the third plate body and hold slotted hole 15 that PCIE module IO interface and sata integrated circuit board IO interface passed, slotted hole 15 is along the rectangle that third plate body length direction set up, slotted hole 15 can be injectd with the cooperation of PCIE module IO interface the position of PCIE module 6. Specifically, as shown in fig. 3, three slots 15 are provided, the slots 15 are provided along the length direction of the third plate, and a plurality of rectangular holes are provided on the periphery of the slots 15. The fixed pivot 13 that sets up on the third plate body, pivot 13 is followed the width direction of third plate body sets up, rotate on the pivot 13 and connect rotatory buckle 7, refer to fig. 4 and show, the fixed cooperation that sets up on the third integrated circuit board worker's word nail 14 of rotatory buckle 7, the top of worker's word nail 14 is conical, worker's word nail 14's lateral wall sets up the recess.

The inner side of the fourth plate body is provided with three groups of clamping grooves 16 along the length direction of the fourth plate body, and the end parts of the clamping grooves 16 are splayed. The outer side of the fourth plate body is fixedly provided with the limiting clamping jaw 2, and the limiting clamping jaw 2 is shown in a combined manner by referring to fig. 8 and fig. 9, the limiting clamping jaw 2 comprises a fixing part and three elastic clamping jaws connected to the fixing part, and the fixing part is riveted and fixed to the outer side of the fourth plate body through a rivet. The elastic clamping jaw is L-shaped and corresponds to the clamping groove 16.

Referring to fig. 12, the PCIE module 6 fixed to the bracket 1 is connected to a card board 61, one end of the card board 61 is inserted into the card slot 16, and an end of the card slot 16 is in a shape of a Chinese character 'ba', so that the card board 61 can be conveniently inserted. The position of the PCIE module 6 can be limited by the cooperation of the card slot 16 and the card plate 61, and when the card plate 61 is inserted into the card slot 16, the end of the elastic clamping jaw of the limiting clamping jaw 2 can abut against the side wall of the card plate 61, so that the PCIE module 6 is limited in the bracket 1.

Limited by the trend of the card slot 16, an opening for inserting the PCIE module 6 or the sata board 5 is formed in the bracket 1, and the opening is arranged opposite to the second board body.

In a specific implementation process, the rotary buckle 7 rotatably connected to the bracket 1 is matched with the limiting clamping jaw 2 to lock the PCIE module 6 in the bracket 1. Specifically, referring to fig. 6 and 7 in combination, the rotating buckle 7 includes a buckle main body 71 having a cross section of a shape of v 21274, two ends of the buckle main body 71 are oppositely provided with a rotating shaft connecting hole 75, the rotating shaft connecting hole 75 is rotatably connected to the rotating shaft 13, a buckle button 72 is movably disposed in the buckle main body 71, specifically, a pair of sliding rods 73 is fixedly disposed in the buckle main body 71, the two sliding rods 73 are disposed in parallel, each sliding rod 73 is externally sleeved with a first spring 77, a screw 76 for limiting the first spring 77 is fixedly disposed at an end of the sliding rod 73, and the buckle button 72 is slidably disposed on the two sliding rods 73. The buckle button 72 is provided with a notch 74 which can be inserted into a groove on the i-shaped nail 14, and the position of the notch 74 corresponds to the position of the i-shaped nail 14, so that when the rotary buckle 7 rotates around the rotating shaft 13 towards the i-shaped nail 14, the notch 74 contacts the conical top of the i-shaped nail 14. The buckle main body 71 is provided with a plurality of claws 78 for limiting the PCIE module 6, and when the rotary buckle 7 is tightly buckled and connected with the I-shaped nail 14, the claws 78 abut against the side wall of the clamping plate 61. When the user controls the rotary buckle 7 to release the PCIE module 6, the user manually pushes the buckle button 72 to make the buckle button 72 slide along the sliding rod 73, the notch 74 on the buckle button 72 is separated from the groove on the i-shaped nail 14, and the rotary buckle 7 can rotate around the rotating shaft 13. When the user controls the rotating buckle 7 to fasten the PCIE module 6, the user pushes the rotating buckle 7 to the i-shaped nail 14, the notch 74 passes through the conical top of the i-shaped nail 14 to reach the side wall of the i-shaped nail 14, and moves to the groove of the side wall of the i-shaped nail 14, and is clamped in the groove of the i-shaped nail 14 under the action of the first spring 77, so that the rotating buckle 7 cannot rotate around the rotating shaft 13, and the clamping jaw 78 is enabled to abut against the side wall of the PCIE module 6 to lock the PCIE module 6 in the bracket 1.

In the specific implementation process, the fixing clamp 21 of the bracket 1 is fixedly arranged on the limiting clamping jaw 2, the fixing clamp 21 comprises a first clamp body 211 connected with the limiting clamping jaw 2, a second clamp body 212 is connected with the first clamp body 211 in a sliding mode, a second spring 213 is arranged between the second clamp body 212 and the limiting clamping jaw 2, and a clamping portion is formed between the first clamp body 211 and the second clamp body 212. In the specific implementation process, first clamp 211 includes two connecting plates that are parallel to each other, two the connecting plate set up relatively with on the fixed part of spacing clamping jaw 2, two connect first grip block between the connecting plate, the fixed gag lever post that sets up on the first grip block, the gag lever post is followed the length direction of connecting plate sets up, two the connecting plate opposite side sets up the stopper respectively, the stopper with sliding connection between the gag lever post second clamp 212, set up on the second clamp 212 with the second grip block that first grip block is relative, first grip block with form between the second grip block the clamping part, second clamp 212 with connect between the spacing clamping jaw second spring 213.

The second plate body is provided with heat dissipation holes 11, and in the specific implementation process, the heat dissipation holes 11 are arranged on the second plate body in an array mode.

The principle of the multilayer PCIE module fixing device for the server provided by the application is as follows:

the Riser card 3 connected with the sata board card 5 and the PCIE module 6 is fixed by the bracket 1, and the position of the PCIE module 6 inserted into the bracket 1 is limited by the matching of a card slot 16 fixedly arranged on the bracket 1 and a card board 61 on the PCIE module 6 and the matching of a slot 15 on the bracket and the IO interface of the PCIE module; and through set up in bracket 1 one end spacing clamping jaw 2 with rotate connect in the bracket 1 other end rotatory buckle 7 cooperation locking PCIE module 6 in the bracket 1, set up buckle button 72 on the rotatory buckle 7, user control rotatory buckle 7 unclamps during PCIE module 6, the user pushes manually buckle button 72 makes buckle button 72 follows slide bar 73 slides, buckle button 72 is last notch 74 with the recess on the I-shaped nail 14 separates, rotatory buckle 7 can wind pivot 13 rotates. When the user controls the rotating buckle 7 to fasten the PCIE module 6, the user pushes the rotating buckle 7 to the i-shaped nail 14, and the notch 74 passes through the i-shaped nail 14 and is clamped in the groove of the i-shaped nail 14 under the action of the first spring 77, so that the clamping jaw 78 abuts against the sidewall of the PCIE module 6 to lock the PCIE module 6 in the bracket 1. When the PCIE module is detached, the operation is simple, the PCIE module is fixed without any bolt, the problems of bolt sliding and corrosion are not needed to be avoided, and the dismounting processes of the PCIE modules are mutually independent when a plurality of groups of PCIE modules are fixed. Connect Riser module connecting plate 4 on the bracket 1, it is convenient the Riser module is connected to bracket 1, the fixation clamp 21 that sets up on the spacing clamping jaw 2 is convenient to be connected bracket 1 and server machine incasement portion mechanism. The server can realize convenient disassembly and assembly of the multilayer PCIE modules.

The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A fixing device for a server multi-layer PCIE module is characterized by comprising a bracket (1), wherein,

an opening for inserting the PCIE module (6) or the sata board card (5) is formed in the bracket (1);

the bracket (1) at one end of the opening is rotatably connected with a rotating buckle (7), an I-shaped nail (14) matched with the rotating buckle (7) is fixedly arranged on the bracket (1), and the rotating buckle (7) is buckled on the I-shaped nail (14) and used for fixing the PCIE module (6) or the rotating buckle (7) and the I-shaped nail (14) are separated and used for disassembling the PCIE module (6);

a limiting clamping jaw (2) is fixedly arranged on the outer side of the bracket (1) at the other end of the opening;

a plurality of card slots (16) are formed in the inner side of the bracket (1) at the other end of the opening, each PCIE module (6) is fixedly provided with a card board (61), and one end of each card board (61) is connected to the card slot (16) in a pluggable mode;

when the PCIE module (6) is inserted into the bracket (1), the limiting clamping jaw (2) limits the clamping plate (61) from the end part of the clamping plate (61).

2. The server multi-layer PCIE module fixing device according to claim 1, wherein the bracket (1) includes a first board body, a second board body, a third board body, and a fourth board body are respectively disposed along a group of long sides and two groups of short sides of the first board body, the second board body, the third board body, and the fourth board body are perpendicular to the first board body, and two ends of the second board body are respectively connected to the third board body and the fourth board body.

3. The multi-layer PCIE module fixing device of the server according to claim 2, wherein a plurality of EMI elastic pieces (12) are fixedly disposed on the first board body, a Riser module connecting board (4) is fixedly disposed on the first board body, and the Riser module connecting board (4) is used for connecting a Riser module.

4. The server multi-layer PCIE module fixing device according to claim 2, wherein the second board body is opposite to the opening, a Riser card (3) is fixedly disposed on an inner side of the second board body, and the Riser card (3) is connected to the PCIE module (6) and the sata board card (5) through an interface.

5. The server multi-layer PCIE module fixing device according to claim 2, wherein a slot (15) for allowing an IO interface of a PCIE module and an IO interface of an sata board card to pass through is disposed on the third board body, a rotating shaft (13) is fixedly disposed on the third board body, the rotating shaft (13) is rotatably connected to the rotating buckle (7), and an i-shaped nail (14) matched with the rotating buckle (7) is fixedly disposed on the third board card.

6. The server multi-layer PCIE module fixing device of claim 5, wherein the rotary buckle (7) comprises a buckle main body (71) with a cross section of a shape of '21274', both ends of the buckle main body (71) are oppositely provided with rotating shaft connecting holes (75), a buckle button (72) is movably arranged in the buckle main body (71), the buckle button (72) is provided with a notch (74) which can be inserted into a groove on the I-shaped nail (14), and the buckle main body (71) is provided with a plurality of claws (78) for limiting the PCIE module (6).

7. The multi-layer PCIE module fixing device for the server according to claim 6, wherein a pair of sliding rods (73) is fixedly arranged in the buckle main body (71), a first spring (77) is sleeved outside each sliding rod (73), a screw (76) for limiting the first spring (77) is fixedly arranged at the end of each sliding rod (73), and the buckle buttons (72) are slidably arranged on the two sliding rods (73).

8. The server multi-layer PCIE module fixing device according to claim 2, wherein the limiting clamping jaw (2) is fixedly disposed on an outer side of the fourth board body, the limiting clamping jaw (2) includes a fixing portion and a plurality of elastic clamping jaws connected to the fixing portion, and the fixing portion is fixed outside the fourth board body through a connecting piece.

9. The server multi-layer PCIE module fixing device according to claim 8, wherein a fixing clip (21) for fixing the bracket (1) is disposed on the limiting clamping jaw (2), the fixing clip (21) includes a first clip body (211) connected to the limiting clamping jaw (2), the first clip body (211) is slidably connected to a second clip body (212), a second spring (213) is disposed between the second clip body (212) and the limiting clamping jaw (2), and a clamping portion is formed between the first clip body (211) and the second clip body (212).

10. The multi-layer PCIE module fixing device of the server according to claim 2, wherein a heat dissipation hole (11) is disposed on the second board body.

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