DE202015001403U1 - Pressure sensitive seat occupancy sensor unit - Google Patents

Abstract

A pressure-sensitive seat occupancy sensor unit (20) for detecting the occupancy state of a seat, comprising: - a support plate (2) having a support surface (3); - At least one spacer (4), which at least one spacer (4) around the support surface (3) is arranged around and forms a support surface (5) which is increased relative to the support surface (3); - A compressible foam body (21) having a lower surface (22) and an upper surface (23), which at least when exerting a force (26, 28) on the upper surface (23) with the lower surface (22) on the support surface (5) rests, - a pressure sensitive membrane switch (6) comprising a first carrier foil and a second carrier foil spaced apart by a spacer foil, said spacer foil having at least one recess defining a cell (7), said pressure sensitive Membrane switch comprises at least two electrodes, which are arranged in the cell (7) opposite to each other on the first and second carrier foil; - An activation body (13), wherein the membrane switch (6) and the activation body are arranged one above the other on the support surface (3) such that the membrane switch (6) or the activation body (13) without exerting the force (26, 28) is spaced from the lower surface (22) of the foam body (21), - wherein the foam body (21) is adapted to move due to the applied force (28) in the space within the at least one spacer (4) and the Membrane switch (6) activated by pressure on the activation body (13) or on the membrane switch (6) when the force (28) exceeds a threshold force.

Description

Technical area

The invention generally relates to the determination of the occupancy state of a vehicle seat. More particularly, the invention relates to a pressure-sensitive seat occupancy sensor unit, a seat occupancy sensor, and a vehicle seat.

Background of the invention

Seat occupancy sensors are now widely used in vehicle seats to provide a seat occupancy signal for various facilities, such as car seats. B. seatbelt control, airbag etc. provide. There are seat occupancy sensors in various variants, which are based, for example, on capacitive measurement, deformation measurement, or pressure or force measurement. Pressure sensitive seat occupancy sensors are commonly located in the prior art between the foam body of the seat cushion and the seat cover.

The possibility of adapting the vehicle according to the customer's request is a central selling point in modern motor vehicles. As a result, many different variants of vehicle interiors are offered for the same vehicle model. The increasing number of available options results in significant restrictions on the design of technical components within the vehicle. In the case of seat occupancy sensors, which are arranged between the foam body of the seat cushion and the seat cover, each seat design (leather, fabric, sports, comfort, etc.) requires development work for the occupancy detection system. This leads to high development costs and is therefore an unattractive solution for the automotive industry. It is therefore an object to find a solution for the sensors that is less influenced by the seat design and thus can be used for a wider variety of vehicle seats or vehicles.

It is also already known in the prior art to arrange sensor units on the B surface of the seat cushion (i.e. on the side facing away from the occupant and thus between the seat cushion and its support). In this case, the pressure is transmitted through the seat cushion on the sensor, whereby the seat cushion is practically a part of the measuring unit. Therefore, the sensor reacts differently depending on the thickness and nature of the seat cushion, which may result in different activation thresholds even with similar sensors.

Technical problem

Against this background, it is an object of the present invention to provide a seat occupancy sensor with increased reliability, which can be integrated into various seat models. The object is achieved by a pressure-sensitive seat occupancy sensor unit according to claim 1, a seat occupancy sensor according to claim 10 and by a vehicle seat according to claim 11.

General description of the invention

The invention provides a pressure-sensitive seat occupancy sensor unit for determining the occupancy state of a seat, in particular a vehicle seat. The seat occupancy sensor unit here comprises a carrier plate with a carrier surface and a pressure-sensitive membrane switch which is arranged on the carrier surface. The membrane switch comprises a first carrier foil and a second carrier foil spaced apart by a spacer foil, the spacer foil having at least one recess defining a cell, the pressure sensitive membrane switch comprising at least two electrodes located in the cell opposite each other on the first one and second carrier foil are arranged. The principle of such a membrane switch, which is known in the prior art, based on the fact that the two electrodes approach each other and possibly touch when a force or impression is exerted on the membrane switch.

Furthermore, the seat occupancy sensor unit comprises at least one spacer, a compressible foam body and an activation body arranged on the membrane switch. The at least one spacer is arranged around the support surface and forms a support surface that is raised relative to the support surface. This of course includes the possibility that a plurality of spacers are present and / or the support surface of several parts, that is not contiguous, is formed. In addition, an activation body can also be arranged below the membrane switch, ie between the membrane switch and the carrier plate.

The compressible foam body has a lower surface and an upper surface. It rests at least when exerting a force on the upper surface with the lower surface on the support surface. Typically, but not necessarily, the compressible foam body rests on the support surface even in the absence of said force. In any case, it is supported in this area by the at least one spacer.

The compressible foam body and the activating body are in this case designed and arranged such that the activating body is spaced from the lower surface of the foamed body without the exertion of said force on the upper surface. In this case, therefore, there is no contact between the foam body and the activation body, so that no direct force flow is given from the upper surface of the foam body to the membrane switch.

The foam body is in this case designed so that it moves as a result of the force exerted in the space within the at least one spacer and activated by pressure on the activation body, the membrane switch when said force exceeds a threshold force.

The term "threshold force" here denotes the force to be exerted on the upper surface of the seat, which sufficiently compresses the foam body (and optionally the activating body) so that the membrane switch is activated as a result. The value may be chosen such that a 5th percentile female or heavier user activates the membrane switch while lighter users (eg, children) or items do not.

The at least one spacer ensures that the compressible foam body is located at a defined distance above the activation body and the underlying membrane switch, as long as the seat is not used. As a result, compared with pressure-sensitive seat occupancy sensors, in which the foam is constantly in contact with the membrane switch, the manufacture, in particular with regard to the thickness of the foam body, is subject to much less stringent restrictions. As will be explained later, the compressible foam body can either be a part designed especially for the function of the sensor unit or else it can be formed by the seat cushion itself.

The provision of the activation body has several effects. On the one hand, the seat occupancy sensor unit becomes more sensitive than in the absence of the activation body, since the foam body already comes into contact with the activation body at a lower deformation, whereby a force is applied to the membrane switch. Furthermore, by means of the shape and extent of the activating body, the action of force can be directed in a targeted manner to specific parts of the membrane switch, without it being necessary to adapt the flexible foam body. Finally, the response of the sensor unit can be modified by the elasticity of the activation body.

The activation body may be mounted on the membrane switch also below the membrane switch. Then, due to the applied force, the foam body moves into the space within the at least one spacer and activates the membrane switch by pressure. The activation body generates a counter force on the membrane switch when the force exceeds a threshold force.

Advantageously, the activation body is formed compressible. It is understood that it is usually an elastic compressibility, d. H. The activation body should return to its original shape when no force is applied to it. In the context of the present invention, the term "compressible" also includes the possibility that, when a force acts, the activating body is compressed in the effective direction of the force, but expands perpendicular to the force, so that the total volume remains virtually unchanged. The compressible property can be achieved by a solid activation body (eg made of soft rubber). Of course, other configurations are possible. It is preferred that the activation body consists at least predominantly of foam. Here, a wide variety of foamed polymers can be used, for example. Polyurethane foam.

In order to achieve an optimal introduction of force to the membrane switch, it is preferred that the activating body at least predominantly covers the at least one cell. Optionally, the activating body may also extend to "inactive" parts of the membrane switch which are not part of the cells, thus insensitive to the action of force.

Advantageously, the at least one spacer is substantially incompressible, which means that no appreciable deformation of the spacer occurs under the typically occurring forces. The spacers may in this case be formed as separately manufactured elements which are connected to the carrier plate. However, it is preferred that the at least one spacer and the carrier plate are integrally formed. Inasmuch as the support plate is to form a solid support for the membrane switch, it preferably has a low deformability, so that the spacers can readily consist of the same material.

The spacer (s) surround the support surface at least partially, but possibly also on all sides. A single spacer may, for example, annular or C-shaped, ie in the manner of an open ring surrounding the support surface. in the If several spacers, they can be arranged with more or less large distance from each other. In the case of a stretched support surface (that is, substantially longer along one direction than transverse thereto), only spacers may possibly be arranged along the long side.

Preferably, each of the carrier foils of the membrane switch comprises a plastic film (eg consisting of PET, PEN, PI, PEEK, PES, PPS, PSU or mixtures thereof) or is formed as a plastic film. By choosing a suitable material, the flexibility of the carrier film can be set practically arbitrarily. Each of the electrodes can be applied as an electrically conductive layer on the respective carrier film. Such a conductive layer may in particular be formed as a printed conductive surface or as a metal foil which is applied to the plastic film. In the presence of multiple cells, these are advantageously connected according to a logical "AND", that is, for example, in series, in order to prevent z. As a heavy, but spatially limited object that activates only one cell when placed on the seat is incorrectly identified as a person. In the spacer film, at least one ventilation channel is preferably integrated, by means of which a pressure compensation can take place when the cells are compressed.

When the electrodes touch each other, contact between the electrodes is closed and the electrical resistance decreases from a high value (corresponding to an open circuit or a test resistor) to a low value (eg, ≦ 100 Ω). The resistance drop may be detected (as changes in resistance, amperage or voltage) by an evaluation unit connected to the pressure-sensitive seat occupancy sensor unit. Advantageously, the at least two electrodes are interconnected by at least one test component (eg a resistor or a diode), which is connected in parallel. This can be an interruption of the circuit (eg., By conductor break) determine.

According to one embodiment of the invention, the support plate comprises at least one fixing element for fastening the support plate to a structural frame and / or a spring of the seat. Both the structural frame and the springs are usually the same for a particular vehicle model, regardless of other design variations of the seat. For example, because the seat is part of the passive safety concept in a motor vehicle, it is usually not changed after this concept has been established. The fixing element may in this case be formed in particular on the support plate. Since attachment without a tool is preferred, for example, a snap connector may be provided. In particular, such a snap connector may be provided to detect a spring of the seat. But it can also be provided on the support plate, a corresponding opening into which a seat side existing connector engages. The fixation elements can be supplemented by guide elements which, for example, facilitate alignment with one or more springs of the seat or on the structural frame.

The at least one fixing element is preferably arranged on an underside of the carrier plate. Thus, for example, by one or more snap connectors on the underside of the support plate can be mounted from above on the springs of the seat. Likewise, the fixing elements can be aligned perpendicular to the support surface (ie below the support surface). Alternatively, however, the fixing elements can also be arranged beyond the carrier surface, for example at the edge of the carrier plate.

In order to allow easy connection to the vehicle systems, the seat occupancy sensor unit preferably comprises a connection cable for connection to a vehicle on-board computer and / or an airbag control.

As already mentioned above, the compressible foam body may be a part of the same made for the seat occupancy sensor unit or it may be provided by the seat cushion of the vehicle seat. In particular, but not exclusively, for the latter case, a seat occupancy sensor is provided according to the invention. This can be used in particular for a seat occupancy sensor unit according to the invention. The seat occupancy sensor comprises a support plate having a support surface, a pressure-sensitive membrane switch disposed on the support surface, at least one spacer, and an activation body disposed on the membrane switch.

The at least one spacer is arranged around the support surface and forms a support surface that is raised relative to the support surface. The pressure-sensitive membrane switch comprises a first carrier foil and a second carrier foil spaced apart by a spacer foil, the spacer foil having at least one recess defining a cell, the pressure-sensitive membrane switch comprising at least two electrodes disposed opposite one another in the cell first and second carrier foil are arranged.

It can also be said that the seat occupancy sensor unit according to the invention comprises such a seat occupancy sensor. The individual components correspond to those of the seat occupancy sensor unit described above and will not be discussed again in detail. Incidentally, preferred embodiments of the seat occupancy sensor correspond to the above-described preferred embodiments of the seat occupancy sensor unit according to the invention.

Finally, the invention provides a vehicle seat, in particular a motor vehicle seat, which comprises a structural frame, a seat cushion for an occupant, either a spring structure supporting the seat cushion or a seat shell and a pressure-sensitive seat occupancy sensor unit according to the invention. Here, the seat occupancy sensor unit is disposed between the seat cushion and the spring structure or the seat pan. In other words, this corresponds to an arrangement on the B surface of the seat cushion.

According to one embodiment, in this case the compressible foam body is formed by the seat cushion.

It is also preferred that the seat cushion has a recess in which the seat occupancy sensor unit is arranged. In a case in which the foam body is formed by the seat cushion itself, this corresponds to a configuration in which all parts of the seat occupancy sensor unit, except for the foam body, are arranged in such a recess of the seat cushion. In the latter case, the foam body defines the recess.

Often, the seat occupancy sensor and / or the membrane switch has a stretched shape, i. H. with respect to the plane given by the carrier plate, the extent along one direction is significantly greater than transverse to it. For example. In this case, several cells can be provided within the membrane switch, which are arranged successively along the direction mentioned. In the case of such a stretched shape, a transverse installation with respect to the vehicle seat is preferred, so that the width of the vehicle seat can be better covered. In other words, in this case, the membrane switch is arranged with a largest extension along a transverse direction of the vehicle seat. In a motor vehicle seat, for example, this corresponds to the y-axis of the motor vehicle.

Another preferred installation position, in particular with the o. G. Orientation in the transverse direction can be combined, is characterized in that the membrane switch is located in front of an H-point of the vehicle seat. As is known, the term "H point" refers to the theoretical position of the hip of an occupant. The membrane switch is here in the longitudinal direction of the seat (eg. Along the x-axis of a motor vehicle) arranged in front of the H-point, so for example. Near the front edge of the seat. The proposed arrangement, a reliable measurement can be ensured even if the occupant leans forward. It is understood that this variant with a further back, z. B. below the H-point, arranged occupancy sensor can be combined.

Brief description of the drawings

Preferred embodiments of the inventions are described below by way of example with reference to the figures. Hereby shows:

1 a plan view of a seat occupancy sensor according to the invention;

2 a view from below of the seat occupancy sensor 1 ;

3 an exploded view of the seat occupancy sensor 1 ;

4 a schematic sectional view of a portion of a vehicle seat with the seat occupancy sensor 1 with unloaded seat;

5 a sectional view accordingly 4 upon application of a force below a threshold value; and

6 a sectional view accordingly 4 upon application of a force which is above the threshold value.

Description of the embodiments

1 shows a plan view of a seat occupancy sensor according to the invention 1 , which is intended for installation in a passenger car. The shape of the seat occupancy sensor 1 is essentially a support plate 2 , consisting of plastic, intended. The carrier plate 2 is roughly rectangular, with the edges are raised web-like on their long sides, making them two spacers 4 form. The tops of the spacers 4 form parts of a support surface 5 facing one in the middle of the carrier plate 2 located carrier surface 3 is raised or raised. The said structure of the carrier plate 2 is in particular in the exploded view of 3 recognizable. On one side of the carrier plate 2 is an opening 17 intended for a belt system.

On the support surface 2 is a membrane switch 6 arranged, which comprises two carrier films which are separated by an intermediate spacer film. In the spacer film, a recess is formed, which by its structure four cells lying substantially on a line 7 Are defined. The cells 7 are substantially circular in cross-section and by smaller openings with each other and with a ventilation opening 16 connected, whereby a pressure exchange is possible. In the area of each cell, pairs of opposing electrodes are printed on the respective carrier foil by means of conductive ink. The respective cells 7 are here connected in series with each other. Will not put pressure on the cells 7 are applied, the electrodes are spaced apart and the resistance of each individual cell 7 is very high (eg in the range of a few megohms). If the electrodes are brought into contact by pressure, the resistance of the individual cell decreases 7 z. B. to 100 Ω. However, when activating a single cell 7 the total resistance due to the series connection is still very high. Only with activation of all four cells 7 the total resistance drops to a correspondingly low value (eg 500 Ω), which acts as an activation of the membrane switch 6 can be interpreted.

To the non-activated state of the membrane switch 6 to distinguish from a cable break are the cells 7 altogether in parallel to a test resistor 8th switched, for example, may have a value of 10 ⁴ -10 ⁵ Ω, which is sufficiently clear from the resistance of the activated membrane switch 6 different. As in the view from below according to 2 as in 3 recognizable, is the membrane switch 6 over a pair of wires 11 with a plug 12 connected to the connection of the seat occupancy sensor 1 is provided with an on-board computer of the vehicle, an airbag control or the like. Switch side are the wires 11 via crimp connections 9 connected and total for insulation and mechanical fuse in a thermoplastic 10 cast.

On the support plate 2 remote side of the membrane switch 6 , So on its top, is a substantially cuboid activation body 13 arranged. In the present case, there is the activation body 13 made of polyurethane foam and is sized to hold essentially all four cells 7 covers. The functioning of the activation body 13 will be described below with reference to the 4 to 6 explained.

4 shows schematically and simplified a sectional view of a portion of a vehicle seat, which is a seat cushion 40 that's on a set of feathers 42 rests, which in turn are connected to a structural frame (not shown). The seat cushion 40 forms a compressible foam body 21 as part of a pressure-sensitive seat occupancy sensor unit 20 acts. The remaining parts of the seat occupancy sensor unit 20 be through the in 1 to 3 shown seat occupancy sensor 1 educated. This is in a lower part of the seat cushion 40 trained recess 41 arranged. He is here by means of snap connectors 14 , the underside of the support plate 2 are molded, with the springs 42 connected to the seat. To the assembly of the carrier plate 2 on the springs 42 are also guiding elements 15 provided, which also integral with the carrier plate 2 are formed.

At the in 4 illustrated unloaded state in which no force on an upper surface 23 of the foam body 21 acts, this rests with a lower surface 22 on the through the spacers 4 given support surface 5 , He thus has a defined distance from the support surface 3 , the membrane switch 6 and the activation body arranged thereon 13 ,

5 shows one 4 corresponding sectional view, although a force 26 on the upper surface 23 of the foam body 21 acts. This causes a deformation of the foam body 21 , which causes this in the area between the spacers 4 but in this case still not the activating body 13 touched. This is because the acting force 26 is below a predefined threshold. It should be noted that the penetration of the foam body 21 in the area above the membrane switch 6 is limited by the fact that he still on the spacers 4 rests.

6 shows the action of a force 28 , which is above the mentioned threshold value. The deformation of the foam body 21 , in particular in the region of its lower surface 22 , is now so strong that he has the activation body 13 touches and exerts pressure on them. As a result, on the one hand, the activation body 13 for its part, it compresses and deforms, and secondly, there is a flow of force from the foam body 21 over the activation body 13 to the membrane switch 6 given, whereby this is activated. The function of the activating body consists, on the one hand, of the membrane switch already at a lower deformation of the foam body 21 to activate than this without the activation body 13 the case would be. On the other hand, that of the surface 23 from acting force 28 by the specific form of the activating body 13 closer to the cells 7 to get redirected.

The 4 to 6 show sections along the longitudinal direction of the vehicle seat, so in a motor vehicle along the xz plane. The individual cells 7 of the membrane switch 6 are thus arranged in the transverse direction of the vehicle seat, whereby a majority of the width of the same can be covered. In this way, a one-way load that does not normally result from a seated occupant merely activates a portion of the cells 7 , which is not considered activation of the membrane switch 6 is registered in total. Advantageously, the seat occupancy sensor 1 be mounted near a front edge of the vehicle seat, so that even with a leaning forward occupant this is reliably detected. Of course, this can be combined with other, for example. Below the H-point mounted seat occupancy sensors.

LIST OF REFERENCE NUMBERS

1

Seat occupancy sensor

2

support plate

3

support surface

4

spacer

5

support surface

6

membrane switches

7

cell

8th

resistance

9

crimp

10

thermoplastic

11

wire

12

plug

13

activation body

14

snap connector

15

guide element

16

vent

17

opening

20

Seat occupancy sensor unit

21

compressible foam body

22

lower surface

23

upper surface

26

Force <threshold force

28

Force> Threshold Force

40

pillow

41

recess

42

feather

Claims (17)

Pressure-sensitive seat occupancy sensor unit ( 20 ) for determining the occupancy state of a seat, comprising: - a carrier plate ( 2 ) with a carrier surface ( 3 ); At least one spacer ( 4 ), which at least one spacer ( 4 ) around the support surface ( 3 ) is arranged around and a support surface ( 5 ) which faces the support surface ( 3 ) is increased; A compressible foam body ( 21 ) with a lower surface ( 22 ) and an upper surface ( 23 ), which at least when a force ( 26 . 28 ) on the upper surface ( 23 ) with the lower surface ( 22 ) on the support surface ( 5 ), - a pressure-sensitive membrane switch ( 6 ), which comprises a first carrier foil and a second carrier foil, which are spaced apart by a spacer foil, wherein the spacer foil has at least one recess, which comprises a cell ( 7 ), wherein the pressure-sensitive membrane switch comprises at least two electrodes arranged in the cell ( 7 ) are arranged opposite one another on the first and second carrier foil; An activation body ( 13 ), the membrane switch ( 6 ) and the activation body in such a way one above the other on the support surface ( 3 ) are arranged such that the membrane switch ( 6 ) or the activation body ( 13 ) without exerting the force ( 26 . 28 ) from the lower surface ( 22 ) of the foam body ( 21 ), wherein the foam body ( 21 ) is designed so that it is due to the applied force ( 28 ) in the space within the at least one spacer ( 4 ) and the membrane switch ( 6 ) by pressure on the activation body ( 13 ) or on the membrane switch ( 6 ) activated when the force ( 28 ) exceeds a threshold force. Seat occupancy sensor unit according to claim 1, characterized in that the pressure-sensitive membrane switch ( 6 ) on the support surface ( 3 ) and that the activation body ( 13 ) on the pressure-sensitive membrane switch ( 6 ) is arranged. Seat occupancy sensor unit according to claim 1, characterized in that the activation body ( 13 ) on the support surface ( 3 ) and that the pressure-sensitive membrane switch ( 6 ) on the activation body ( 13 ) is arranged. Seat occupancy sensor unit according to one of claims 1 to 3, characterized in that the activation body ( 13 ) is compressible. Seat occupancy sensor unit according to claim 4, characterized in that the activation body ( 13 ) consists at least predominantly of foam. Seat occupancy sensor unit according to one of claims 1 to 5, characterized in that the activation body ( 13 ) the at least one cell ( 7 ) at least predominantly covered. Seat occupancy sensor unit according to one of claims 1 to 6, characterized in that the at least one spacer ( 4 ) is substantially incompressible. Seat occupancy sensor unit according to one of claims 1 to 7, characterized in that the at least one spacer ( 4 ) and the carrier plate ( 2 ) are integrally formed. Seat occupancy sensor unit according to one of claims 1 to 8, characterized in that the Support plate ( 2 ) at least one fixing element ( 14 ) for fixing the carrier plate ( 2 ) on a structural frame and / or a spring ( 42 ) of the seat. Seat occupancy sensor unit according to claim 9, characterized in that the at least one fixing element ( 14 ) on a lower side of the carrier plate ( 2 ) and / or perpendicular to the support surface ( 3 ) is arranged. Seat occupancy sensor unit according to one of claims 1 to 10, characterized by a connection cable ( 11 . 12 ) for connecting the seat occupancy sensor unit ( 20 ) with a vehicle on-board computer and / or an airbag control. Seat occupancy sensor ( 1 ), in particular for a seat occupancy sensor unit ( 20 ) according to one of claims 1 to 11, comprising: - a carrier plate ( 2 ) with a carrier surface ( 3 ); A pressure-sensitive membrane switch ( 6 ) located on the support surface ( 3 ) and which comprises a first carrier foil and a second carrier foil, which are spaced apart from one another by a spacer foil, wherein the spacer foil has at least one recess which forms a cell ( 7 ), wherein the pressure-sensitive membrane switch comprises at least two electrodes arranged in the cell ( 7 ) are arranged opposite one another on the first and second carrier foil; At least one spacer ( 4 ), which at least one spacer ( 4 ) around the support surface ( 3 ) is arranged around and a support surface ( 5 ) which faces the support surface ( 3 ) is increased; and - one on the membrane switch ( 6 ), compressible activation body ( 13 ). A vehicle seat, comprising: - a structural frame, - a seat cushion ( 40 ) for an occupant, - either a spring structure supporting the seat cushion ( 42 ) or a seat pan, and a pressure-sensitive seat occupancy sensor unit ( 20 ) according to one of claims 1 to 11, wherein the seat occupancy sensor unit ( 20 ) between the seat cushion ( 40 ) and the spring structure ( 42 ) or the seat pan is arranged. Vehicle seat according to claim 12, characterized in that the compressible foam body ( 21 ) through the seat cushion ( 40 ) is formed. Vehicle seat according to one of claims 13 or 14, characterized in that the seat cushion ( 40 ) a recess ( 41 ), in which the seat occupancy sensor unit ( 20 ) is arranged. Vehicle seat according to one of claims 13 to 15, characterized in that the membrane switch ( 6 ) is arranged with a greatest extent along a transverse direction of the vehicle seat. Vehicle seat according to one of claims 13 to 16, characterized in that the membrane switch ( 6 ) is arranged in front of a H-point of the vehicle seat.

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