JP2005152232A - Mattress - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mattress providing a user with comfortable sleep and easiness in sitting up, and enabling the easy recycling and reduction of disposal costs. <P>SOLUTION: The mattress 10 comprises a board-shaped cushioning material 10 and a cover for covering the cushioning material 10. The cushioning material 10 is molded from a polyethylene foamed body. The cushioning material 10 is composed of a laminate comprising an A' layer formed of a board-shaped frame part, in which a mesh-like sheet is stored, and a B' layer formed of a uniform board-shaped body. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a mattress that is comfortable to sleep and easy to start up. The present invention also relates to a mattress that can be easily recycled. In particular, the present invention relates to a mattress for medical care that can be suitably used in hospitals and nursing care facilities.

  Mattresses used in hospitals are often used by people with physical disabilities, so those with excellent sleeping comfort and ease of getting up are preferred. Further, during use in a hospital, a tres is preferred because it can be easily cleaned or replaced because there is a risk that pathogenic bacteria may adhere to the surface or inside. Furthermore, since mattresses used in hospitals are treated as medical waste and have high disposal costs, those that are easy to recycle and can reduce disposal costs are preferred. For this reason, there is an increasing need for mattresses that have excellent user comfort and ease of rising, are easy to maintain such as cleaning and replacement, are easy to recycle, and can reduce disposal costs. Only the mattress described in Patent Document 1 and the mattress preventing mattress described in Patent Document 2 are provided, and there is no actual mattress that can meet all of these needs.

Japanese Patent Laid-Open No. 06-245850 (Claims, Effects of the Invention, FIG. 2) Japanese Patent Publication No. 06-055214 (Claims, Fig. 2)

  That is, the mattress of Patent Document 1 is a laminate of a plurality of cushion materials having different hardness joined to each other by thermal welding, and the load applied above the cushion material is gradually absorbed by each cushion material. Although there is a certain effect in terms of the effect, there is no difference in elasticity between the edge and the center of the cushion material. For this reason, if the cushion material is softened to give the user a good sleeping comfort, even the edge of the cushion material becomes unnecessarily soft, and when the user touches the edge of the cushion material, that part Will sink greatly. Therefore, when the mattress is placed on the bed, it is difficult for the user to get up from the bed. On the other hand, if the cushion material is hardened, the user cannot be given a good sleeping comfort.

  Further, the floor slip prevention mattress of Patent Document 2 is composed of a first member having at least one depressed portion and a second member that fits in close contact with the depressed portion, and includes an edge portion of the cushion material. Although there can be a difference in elasticity between the central portion and the first member, the first member and the second member are only different in size and shape, and there is no difference in hardness or density of the member itself. . For this reason, a large difference in elasticity cannot be provided between the edge portion and the center portion of the cushion material. Furthermore, the cushion material is made of polyurethane, which is known to generate harmful substances such as dioxins when burned, and it is difficult to say that it is excellent from the viewpoint of recycling and waste disposal.

  The present invention has been made to solve the above-described problems, and provides a mattress that is comfortable to sleep and easy for a user to get up. Further, the present invention provides a mattress that can be easily maintained such as cleaning and replacement, can be easily recycled, and can reduce disposal costs. Furthermore, the present invention provides a mattress for medical care that can be suitably used in a hospital or a nursing facility.

  In the mattress composed of a plate-shaped cushion material and a cover that covers the cushion material, the above-described problem is that the cushion material is substantially formed of a polyethylene foam, and the peripheral edge portion of the cushion material is more structural than the central portion. This is solved by providing a mattress characterized by being rigid. Accordingly, it is possible to provide a mattress that is excellent in the user's comfort and ease of rising, can be easily recycled, and can reduce the disposal cost.

  Here, the peripheral portion of the cushion material is structurally harder than the central portion, while the peripheral portion of the cushion material is the same or similar material and the peripheral portion of the cushion material is more than the central portion. Also says that it is hard in shape. In general, the polyethylene foam includes its density (the mass of the polyethylene foam, the total volume of the polyethylene foam (if the polyethylene foam has an opening, a groove, or a hollow part, the volume of the foam). Including the volume of voids generated at the time of the above.) When the value divided by) is increased, it can be made hard, and when the density is reduced, it can be made soft. For example, even if the plate-like body and the mesh-like sheet have the same thickness, the latter is structurally softer.

  At this time, the cushion material is provided with an A layer in which a peripheral portion is formed of a hard cushion material and a central portion is formed of a soft cushion material, and a B layer in which the peripheral portion and the central portion are both formed of a hard cushion material. It is preferable to consist of a laminated body. Thereby, it becomes easy to make the central part of the cushion material soft while giving the necessary strength to the entire cushion material. Here, “hard” of hard cushion material and “soft” of soft cushion material are not evaluated based on absolute standards, but are evaluated relatively between hard cushion material and soft cushion material. It is.

  It is also preferable that the soft cushion material is a mesh-like sheet formed of polyethylene foam. This makes it possible to make the soft cushion material structurally soft while being simple and easy to mold. It is also preferable that the hard cushion material is a plate-like body formed of polyethylene foam. This makes it possible to make the hard cushion material structurally hard while being simple and easy to mold.

  It is also preferable that the A layer and the B layer are bonded by thermal welding. As a result, the A layer and the B layer can be bonded without using an adhesive or the like, so that the cushion material can be molded only from polyethylene foam, and the mattress recycling efficiency is improved. It becomes possible.

  Further, the above-mentioned problem is that in a mattress for medical care comprising a plate-shaped cushion material and a cover covering the cushion material, the cushion material is substantially formed of a polyethylene foam, and the cushion material is a plate. A laminate in which an A ′ layer formed by a frame-like frame portion and a mesh sheet accommodated in a space surrounded by the plate-like frame portion and a B ′ layer formed by a uniform plate-like body are arranged It can also be solved by providing a mattress for medical care characterized by comprising the body. Here, the plate-like frame portion corresponds to a hard cushion material at the peripheral portion of the A layer, and the mesh sheet corresponds to a soft cushion material at the central portion of the A layer. The A ′ layer corresponds to the A layer, and the B ′ layer corresponds to the B layer.

  At this time, it is preferable that the plate-like frame portion has a ventilation means for communicating the space surrounded by the plate-like frame portion and the outside of the plate-like frame portion. Thereby, the air permeability inside the cushion material can be secured, and the mattress can be made clean and hygienic. It is also preferable that a heat dissipation sheet is disposed between the cushion material and the cover. Thereby, it is possible to prevent heat from being accumulated in the cushion material and provide a good sleeping comfort to the user of the mattress. Examples of the heat radiating sheet include polyester mesh sheets.

  In the mattress of the present invention, since the cushion material is substantially formed of a polyethylene foam, it can be easily recycled and the disposal cost can be reduced. In addition, the mattress of the present invention is not only excellent in sleeping comfort but also easily rises by the user because the peripheral edge portion of the cushion material is structurally harder than the central portion. For this reason, it becomes possible to provide the mattress which can be used conveniently for medical care.

  Hereinafter, preferred embodiments of the mattress of the present invention will be specifically described with reference to the drawings, but the mattress of the present invention is not limited thereto.

  FIG. 1 is a perspective view showing the entire cushion material 10. The cushion material 10 is not particularly limited as long as it is substantially made of a polyethylene foam, and may be a slightly mixed impurity, but in this embodiment, only the polyethylene foam is used. Molding. For this reason, even if the cushion material 10 combusts entirely, harmful substances, such as dioxin, are hardly generated. In addition, when a new cushion material is molded using the discarded cushion material 10 as a recycled material, it is not necessary to separate impurities other than polyethylene from the discarded cushion material 10, and the recycling becomes very easy. ing. Therefore, it can be expected that a so-called deposit system in which the recycler refunds the raw material fee to the waste provider will be widely used in collecting mattresses.

  The bubbles of the polyethylene foam molded on the cushion material 10 are preferably open cells. Thereby, it is possible to improve not only the air permeability and water permeability of the cushion material 10 but also the elasticity (shape restoration property). The porosity of the polyethylene foam molded into the cushion material 10 is appropriately adjusted within a range of usually 5 to 50%. This is because if the porosity is less than 5%, the cushion material may not be provided with the required elasticity, and if it is greater than 50%, the cushion material may not be provided with the required strength. This porosity is more preferably 10% or more, and further preferably 40% or less.

  The shape of the cushion material 10 is not particularly limited as long as it is a plate-like body having a certain thickness, but the cushion material 10 is generally rectangular in plan view. The size of the cushion material 10 varies depending on the size of the bed on which the mattress is laid, and is not particularly limited. However, the length of one side forming the upper surface of the cushion material 10 is usually 40 to 250 cm. The thickness is usually 3 to 20 cm. In this embodiment, the upper surface and the bottom surface of the cushion material 10 are rectangular with a short side of 83 cm and a long side of 190 cm, and the thickness of the cushion material 10 is about 8 cm. As the mattress, a cushion material 10 having a short side length of 90 cm or 100 cm (both long sides are 190 cm) can be preferably used. These are standard dimensions for cushioning materials used in bed mattresses.

  The peripheral edge portion of the cushion material 10 is structurally harder than the central portion of the cushion material 10. This configuration can be realized, for example, by making the porosity of the polyethylene foam forming the peripheral portion of the cushion material 10 smaller than the porosity of the polyethylene foam forming the central portion of the cushion material. In the embodiment, as will be described later, the cushion material 10 is formed by accommodating a mesh sheet in a space surrounded by a plate-like frame portion and an A ′ layer formed by a uniform plate-like body. This is realized by a laminated body in which a plurality of layers are arranged. Although this laminated body may be formed by thermally welding the A ′ layer and the B ′ layer in order from one side (upper surface side or bottom surface side) in the thickness direction of the cushion material 10, the cushion material 10 is configured. When the number of layers is large as in the present embodiment (16 layers), the cushion material 10 obtained may be warped on the upper surface side or the bottom surface side, and therefore, it is preferably formed in the following order.

  First, as shown in FIG. 2, the plate-like frame portion 20 (plate-like bodies 21 to 23) that forms the peripheral portion of the A ′ layer and the plate-like body 30 that forms the B ′ layer are bonded by thermal welding. 3 is obtained. It is preferable that the thermal welding between the plate-like frame portion 20 and the plate-like body 30 is performed over the entire surface where the plate-like frame portion 20 and the plate-like body 30 are in contact with each other so that they are not peeled off. The plate-like frame portion 20 and the plate-like body 30 are both formed only from polyethylene foam. Although the thickness of the plate-shaped body 30 is not specifically limited, In this embodiment, it is about 5 mm.

  The plate-like frame portion 20 used at this time may be integrally molded, but in this embodiment, six plate-like bodies 21, 12 plate-like bodies 22, and two plates. It is formed by arranging the body 23 in a frame shape. Among these, the plate-like body 21 and the plate-like body 22 that form the long side of the plate-like frame portion 20 are arranged such that a gap is left between the plate-like bodies 21 and 22 arranged next to each other. Thereby, the ventilation means 24 (FIG. 3, FIG. 8) which connects the space enclosed by the plate-shaped frame part 20 and the exterior of the plate-shaped frame part 20 can be formed easily. On the other hand, when the ventilation means is provided in the integrally formed plate-like frame portion, it is necessary to form a through hole or a through groove that communicates the inner peripheral surface and the outer peripheral surface of the plate-like frame portion.

  The place where the ventilation means 24 is provided may be the short side (plate-like body 23) of the plate-like frame portion 20, but is preferably the long side of the plate-like frame portion 20 as in the present embodiment. Thereby, the ventilation means 24 becomes a hinge portion, and the cushion material 10 is easily bent with an axis parallel to the short side direction as a fold. This configuration is particularly effective when the bed on which the mattress is installed is a foldable type. Further, the interval between the plate-like body 21 and the plate-like body 22 or the interval between the plate-like body 22 and the plate-like body 22 varies depending on the width of the plate-like frame portion 20 and is not particularly limited. It is preferable that it is 0.5-5.0 cm. If the distance is less than 0.5 cm, the air permeability of the cushion material 10 may be reduced. If the distance is greater than 5.0 cm, the strength of the peripheral edge of the cushion material 10 may be reduced. is there. In this embodiment, the interval between the plate-like body 21 and the plate-like body 22 or the interval between the plate-like body 22 and the plate-like body 22 is 2 to 3 cm.

  The width of the peripheral edge portion of the plate-like frame portion 20 varies depending on the dimensions of the cushion material 10 and is not particularly limited, but is usually 5 to 30 cm. This is because, when the width of the peripheral edge portion of the plate-like frame portion 20 is less than 5 cm, the portion may easily sink when the user touches the edge of the mattress. The width of the peripheral edge portion of the plate-like frame portion 20 is more preferably 7 cm or more, and further preferably 9 cm or more. On the other hand, if the width of the peripheral portion of the plate-like frame portion 20 is larger than 30 cm, there is a possibility that the space surrounded by the plate-like frame portion 20 cannot be sufficiently secured. The width of the peripheral edge portion of the plate-like frame portion 20 is more preferably 20 cm or less, and further preferably 15 cm or less. In the present embodiment, the width of the peripheral edge portion of the plate-like frame portion 20 is about 10 cm. For this reason, the space surrounded by the plate-shaped frame portion 20 has a long side of about 170 cm and a short side of about 63 cm. Further, the thickness of the plate-like frame portion 20 is not particularly limited, but in the present embodiment, two plate-like bodies having a thickness of about 5 mm are stacked and thermally welded to be used as the plate-like frame portion 20. Therefore, it is about 1 cm. For this reason, the height of the space surrounded by the plate-like frame portion 20 is about 1 cm.

  Next, as shown in FIG. 4, the soft cushion material 50 is accommodated in the space surrounded by the plate-like frame portion 20. The soft cushion material 50 is not particularly limited as long as it is structurally softer than the plate-like frame portion 20, and is a plate-like body having a waved upper surface and a bottom surface, or a plate-like body having a hollow portion inside. However, in this embodiment, a mesh sheet is used. As described above, by forming the peripheral portion and the central portion of the A ′ layer as separate members, it is possible to easily realize that the peripheral portion of the cushion material 10 is structurally harder than the central portion.

  The shape and size of the mesh sheet used as the soft cushion material 50 are not particularly limited as long as the mesh sheet can be accommodated in the space surrounded by the plate-like frame portion 20, and a plurality of sheets may be arranged. In this embodiment, in consideration of the manufacturing convenience of the mesh sheet, two substantially rectangular mesh sheets having a short side of about 63 cm and a long side of about 85 cm are used. For this reason, the mesh-like sheet can be spread in the space surrounded by the plate-like frame portion 20.

  The thickness of the mesh sheet used as the soft cushion material 50 is appropriately adjusted according to the thickness of the plate-like frame portion 20 and is not particularly limited, but is 50 to 95% of the thickness of the plate-like frame portion 20. Is preferred. If the thickness of the mesh sheet is less than 50% of the thickness of the plate-like frame portion 20, the mesh-like sheet may be bent in the space surrounded by the plate-like frame portion 20. The thickness of the mesh sheet is more preferably 70% or more of the thickness of the plate-like frame portion 20, and further preferably 75% or more. Further, if the thickness of the mesh sheet is larger than 95% of the thickness of the plate-like frame portion 20, there is a possibility that the air permeability of the space surrounded by the plate-like frame portion 20 may be hindered. The thickness of the mesh-like sheet is more preferably 90% or less of the thickness of the plate-like frame portion 20, and further preferably 85% or less. In this embodiment, the thickness of the mesh sheet is about 0.8 cm, which is about 80% of the thickness of the plate-like frame portion 20.

  The shape and dimensions of the mesh of the mesh-like sheet used as the soft cushion material 50 are not particularly limited as long as the elasticity necessary for the cushion material 10 can be imparted, but in this embodiment, as shown in FIG. Using a plurality of wires 51 arranged in parallel at intervals of about 1 cm, and a plurality of wires 51 and other wires 52 arranged so as to form an angle of about 30 degrees are thermally welded. Yes. For this reason, the mesh-like sheet has a rhombus with a side length of about 20 mm and an acute angle of 30 degrees. The cross-sectional shapes of the wires 51 and 52 are semi-elliptical shapes obtained by cutting an ellipse having a major axis of about 15 mm and a minor axis of about 8 mm along the major axis. As shown in FIG. 4 or FIG. 6, the mesh sheet is disposed in such a direction that the longer diagonal line of the rhombus formed in the mesh sheet sheet is parallel to the short direction of the cushion material 10. It is preferable. Thereby, it becomes possible to make the cushion material 10 bend easily with an axis parallel to the short side direction as a fold.

  FIG. 6 shows a plate-like body 30 that houses a soft cushion material 50 (mesh-like sheet) in a space surrounded by the plate-like frame portion 20 in the laminate 40 of FIG. It is the perspective view which showed the laminated body 41 obtained by heat-welding. The thermal welding of the soft cushion material 50 and the plate-like body 30 is preferably performed partially so as not to impair the elasticity of the soft cushion material 50. In this embodiment, the thermal welding of the soft cushion material 50 and the plate-like body 30 is performed at intervals of about 10 cm.

  Next, as shown in FIG. 7, the plate-like body 30 constituting the B ′ layer is thermally welded to the upper surface of the laminate 41 of FIG. 6 to obtain the laminate 42 shown in FIG. 8. In the same procedure, a plurality of sets of laminates 42 are prepared, and a plurality of plate-like bodies 30 constituting the B ′ layer are prepared. The number of the laminated bodies 42 prepared at this time and the number of the plate-like bodies 30 constituting the B ′ layer differ depending on the desired thickness of the cushioning material 10 and the like, and are not particularly limited. Three sets are prepared, and two plate-like bodies 30 are prepared.

  Subsequently, when three sets of laminated bodies 42 and two plate-like bodies 30 are arranged as shown in FIG. 9 and each is thermally welded, a laminated body 43 shown in FIG. 10 is obtained. Although this laminated body 43 has already required elasticity as a cushioning material, as shown in FIG. 11, it is preferable that the corrugated sheet 60 is thermally welded to the upper surface or the bottom surface of the laminated body 43. Thereby, not only can a mattress with a high massage effect capable of locally pressing the human body be provided, but also a trough formed in the corrugated sheet 60 becomes a crease, thereby bending the cushion material 10. It is also possible to guide.

  In this embodiment, the corrugated sheet 60 shown in FIG. 12 is used. Although the space | interval of the peak part of the corrugated sheet 60 is not specifically limited, It is preferable that it is 3-50 mm. If the distance is less than 3 mm, the corrugated sheet 60 may be difficult to guide the bending of the cushion material 10. The interval between the peak portions of the corrugated sheet 60 is more preferably 5 mm or more. On the other hand, when the interval between the peak portions of the corrugated sheet 60 is larger than 50 mm, it may be difficult to give the user a good sleeping comfort. The interval between the crests of the corrugated sheet 60 is more preferably 30 mm or less, and further preferably 20 mm or less. In the present embodiment, the interval between the crests of the corrugated sheet 60 is 7 to 10 mm. Moreover, it is preferable that the depth of the trough part of the corrugated sheet 60 is 3-30 mm. There exists a possibility that the massage effect of the cushioning material 10 may reduce that the depth of a trough part is less than 3 mm. The depth of the valley is more preferably 5 mm or more. On the other hand, if the depth of the valley portion of the corrugated sheet 60 is greater than 30 mm, it may be difficult to give the user good sleeping comfort. The depth of the valley is more preferably 20 mm or less, and further preferably 15 mm or less. In the present embodiment, the depth of the valley portion of the corrugated sheet 60 is 7 to 10 mm.

  FIG. 13 is an enlarged view of the side portion of the cushion material 10 of FIG. 1. When this is seen, the cushion material 10 is composed of 16 layers, and the outermost layer of the cushion material 10 (the uppermost layer of FIG. 13). It can be seen that the lowermost layer) is the C layer. The number of layers forming the cushion material 10 is appropriately selected depending on the thickness of each layer and is not particularly limited, but is usually 3 to 20 layers.

  As shown in FIG. 14, the cushion material 10 may have a divided portion 70. The cushion material 10 of FIG. 14 has two divided portions 70 parallel to the short side direction, and is divided into three equal parts in the longitudinal direction. Thereby, not only can the cushion material 10 be replaced for each part, but also the folding of the mattress can be made easier. When the mattress is easily folded, not only the mattress can be easily stored, but also the mattress can be suitably used in a folding bed.

  The mattress is completed by accommodating the cushion material 10 thus obtained in the cover 80 shown in FIG. The material of the cover 80 is preferably a material that can be easily discarded and recycled. In this embodiment, a material made of polyester is used. A heat radiating sheet (not shown) made of the same material as the cover 80 is thermally welded to the inner surface of the cover 80. In this embodiment, the heat-dissipating sheet is a mesh. As a result, the heat conduction of the mattress can be reduced, and a better sleeping comfort can be imparted to the user. Further, a fastener 82 is provided on the side of the cover 80, and a handle concealment 83 for concealing the handle of the fastener 82 is provided on one end thereof. This pull-out cover 83 can prevent an infant or a person with dementia from opening the fastener 82 in a casual manner.

It is the perspective view which showed the whole cushion material. It is the disassembled perspective view which showed the state before heat-welding the plate-shaped frame part which comprises A 'layer, and the plate-like body which comprises B' layer. It is the perspective view which showed the laminated body obtained by heat-welding the plate-shaped frame part which comprises A 'layer, and the plate-like body which comprises B' layer. It is the disassembled perspective view which showed the state before accommodating a soft cushion material (mesh-like sheet | seat) in the space enclosed by the plate-shaped frame part in the laminated body of FIG. It is the perspective view which expanded the soft cushion material (mesh-like sheet | seat) which comprises A 'layer. The soft cushion material (mesh-like sheet) is accommodated in the space surrounded by the plate-like frame portion in the laminate of FIG. 3, and obtained by thermally welding the soft cushion material and the plate-like body constituting the B ′ layer. It is the perspective view which showed the laminated body. FIG. 7 is an exploded perspective view showing a state before heat-welding the laminated body of FIG. 6 and a plate-like body constituting the B ′ layer. It is the perspective view which showed the laminated body obtained by heat-welding the laminated body of FIG. 6, and the plate-shaped body which comprises B 'layer. FIG. 9 is an exploded perspective view showing a state before three sets of the laminates of FIG. 8 are prepared and heat-welded with a plate-like body constituting a B ′ layer sandwiched between the laminates. FIG. 9 is a perspective view showing a laminated body obtained by preparing three sets of the laminated body of FIG. 8 and heat-sealing with a plate-like body constituting a B ′ layer sandwiched between the laminated bodies. It is the disassembler who showed the state before heat-welding the corrugated sheet which comprises C layer on the upper and lower surfaces of the laminated body of FIG. It is the perspective view which expanded the corrugated sheet which comprises C layer. It is the enlarged view which looked at the D section of the cushion material of FIG. 1 from the E side. It is the perspective view which showed the whole cushion material which has a division part. It is the perspective view which showed the cover which coat | covers a cushioning material.

Explanation of symbols

10 Cushion material 20 Plate-shaped frame part 21-23 Plate-shaped body (A 'layer)
24 Ventilation means 30 Plate body (B 'layer)
40-43 Laminate 50 Soft cushion material (A 'layer)
51, 52 Wire material 60 Corrugated sheet 70 Dividing part 80 Cover 81 Outer fabric 82 Fastener 83 Hiding the handle

Claims (8)

In a mattress composed of a plate-shaped cushion material and a cover covering the cushion material, the cushion material is substantially formed of a polyethylene foam, and the peripheral edge of the cushion material is structurally harder than the central portion. A mattress characterized by that. The cushion material is a laminate in which an A layer whose peripheral portion is formed of a hard cushion material and a central portion thereof is formed of a soft cushion material, and a B layer whose peripheral portion and central portion are both formed of a hard cushion material. The mattress according to claim 1, comprising: The mattress according to claim 2, wherein the soft cushion material is a mesh-like sheet formed of polyethylene foam. The mattress according to claim 2 or 3, wherein the hard cushion material is a plate-like body formed of polyethylene foam. The mattress according to any one of claims 1 to 4, wherein the A layer and the B layer are bonded by thermal welding. In a mattress for medical care comprising a plate-shaped cushion material and a cover covering the cushion material, the cushion material is substantially formed of a polyethylene foam, and the cushion material is formed of a plate-shaped frame portion and the plate. A laminate comprising an A ′ layer formed with a mesh sheet accommodated in a space surrounded by a frame and a B ′ layer formed with a uniform plate. Mattress for medical care. The mattress for medical care according to claim 6, wherein the plate-like frame portion has ventilation means for communicating the space surrounded by the plate-like frame portion and the outside of the plate-like frame portion. The mattress according to claim 6 or 7, wherein a heat dissipation sheet is disposed between the cushion material and the cover.

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