KR102549295B1 - Arithmetic block - Google Patents

Abstract

The arithmetic block includes a plurality of unit blocks having a through hole passing through the center in an axial direction; a fixing post passing through the through hole and connecting the plurality of unit blocks stacked in the axial direction; a sign mounted on an outer circumferential surface of the unit block to surround the outer circumferential surface of the unit block; and a plurality of magnets provided in the unit block and spaced apart at regular intervals along the circumferential direction of the unit block. According to this configuration, it is possible to maintain a required degree of coupling force while easy separation and coupling, and obtain a sense of rotation without loosening in the conventional mechanical gear method.

Description

Arithmetic block {ARITHMETIC BLOCK}

The present invention relates to a arithmetic block that can be used as a arithmetic teaching aid, a coloring teaching aid, and a toy.

In general, block toys have been a major axis of daily play culture of various age groups from infants to elementary and middle school students.

Furthermore, block toys have been widely used as teaching aids for basic scientific principles such as the characteristics of structures, gears and principles, lever principles, pulley principles, and wheels and axis principles for kindergarten and elementary school students.

Various types of theme learning are currently in progress with the goal of improving creativity and problem-solving skills through the implementation of multiple models using various types of blocks, and efficient education of basic science principles.

In conventional blocks, there are many ways in which coupling methods are inserted using grooves or attached using magnets.

Conventionally, in order for a plurality of blocks to rotate relative to each other, there are many methods of using blocks that serve as gears interdigitated between blocks. A conventional block may implement a clicking feeling when rotating using a gear or the like.

However, in the conventional method using blocks serving as gears, as the number of repetitions by rotation of each block increases, the coupling of each block becomes loose, resulting in instability, and the rotation of the block is not smooth.

A first object of the present invention is to provide an arithmetic block having a structure capable of obtaining rotational feeling without loosening in the conventional mechanical gear method.

A second object of the present invention is to provide a calculation block having a structure capable of maintaining a necessary degree of coupling force while being easy to separate and combine.

A third object of the present invention is to provide a calculation block having a structure in which the number of blocks can be expanded as necessary and various modifications such as calculation, color, and game are possible.

In order to achieve the above-mentioned first object, in the calculation block according to the present invention, a plurality of magnets may be mounted at a specific position of the unit block, for example, at a predetermined angle in the rotational direction of the unit block.

In order to achieve the second object described above, the calculation block according to the present invention is a polygonal unit or near the center of both sides of the unit block so that a plurality of magnets can be detached and attached in the stacking direction of the unit block or in the rotation direction of the unit block. Can be equipped at each corner of a block.

In order to achieve the above-described third object, the calculation block according to the present invention may form a through hole in the center of each of a plurality of unit blocks, and insert and couple a fixing post to the through hole. Through this, the fixing post can reinforce the rotational stability of the unit block.

In addition, the signs are provided in a plurality of sets so as to enable various uses such as calculation, color, and games, and can be configured to be detachable from the side of each unit block.

According to one example related to the present invention, the arithmetic block may include a plurality of unit blocks having through-holes penetrating in an axial direction at a central portion; a fixing post passing through the through hole and connecting the plurality of unit blocks stacked in the axial direction; a sign mounted on an outer circumferential surface of the unit block to surround the outer circumferential surface of the unit block; and a plurality of magnets provided in the unit block and spaced apart at regular intervals along the circumferential direction of the unit block.

According to an example related to the present invention, each of the plurality of unit blocks rotates independently around the fixing pillar, and when the plurality of unit blocks rotate, they are coupled by magnetic force between a plurality of magnets aligned in the axial direction. can

According to an example related to the present invention, the plurality of magnets may be composed of at least one magnet for each area having the same area when the unit block is viewed in the axial direction.

According to one example related to the present invention, the plurality of magnets may be disposed at a constant distance from the through hole in a radial direction.

According to an example related to the present invention, the plurality of magnets may include a plurality of first magnets arranged to be spaced apart from the through hole by a first distance in a radial direction; and a plurality of second magnets spaced apart from the through hole by a second distance shorter than the first distance in a radial direction.

According to an example related to the present invention, the first magnet may be disposed adjacent to an outer circumferential surface of the unit block, and the second magnet may be disposed adjacent to the through hole.

According to one example related to the present invention, the magnet may be formed in a cylindrical or circular shape.

According to an example related to the present invention, each of the through hole and the fixing post may have a diameter corresponding to each other and may be formed in a circular shape.

According to an example related to the present invention, the unit block may be formed in an N-gonal shape.

According to an example related to the present invention, the unit block may be formed in a 10-gon shape.

According to an example related to the present invention, the outer circumferential surface of the unit block may include a plurality of planes continuously arranged in a circumferential direction, and two planes adjacent in the circumferential direction may form a predetermined angle.

According to an example related to the present invention, a fixing ring mounted on the fixing post and fixed to one side of the unit block may be further included.

According to an example related to the present invention, the fixing ring has both sides facing opposite to the axial direction are formed as flat surfaces, and the fixing ring includes an opening formed to correspond to the through hole so that the fixing pillar passes through; and a plurality of magnets spaced apart from the opening by a predetermined distance in the radial direction and spaced apart from each other at regular intervals along the circumferential direction.

According to an example related to the present invention, the fixing post may be composed of a writing instrument.

According to an example related to the present invention, the sign is composed of a plurality of sculptural panels formed in a shape corresponding to one surface of the N-gon and in surface contact with the outer circumferential surface of the unit block, and the number of one surface of the N-gon and the The number of carved panels corresponds to each other, and each of the plurality of carved panels may be arranged in a line along the circumferential direction of the unit block and connected to be folded or unfolded.

According to an example related to the present invention, the sign may be detachably mounted to the unit block by a magnet.

An operation block according to an embodiment of the present invention includes a fixed column; a plurality of unit blocks stacked along the longitudinal direction of the fixing post and rotatably coupled to the fixing post; and a plurality of magnets disposed inside the unit block at regular intervals in the circumferential direction, aligned in the stacking direction of the unit block when the unit block rotates, and providing bonding force between the plurality of stacked unit blocks. can include

A calculation block according to another embodiment of the present invention includes a fixed column; a plurality of unit blocks stacked from the lower side to the upper side along the longitudinal direction of the fixing column and rotatably coupled to the fixing column about the fixing column; a plurality of magnets disposed inside the unit block at regular intervals in the circumferential direction, aligned in the stacking direction of the unit block when the unit block rotates, and providing bonding force between the plurality of stacked unit blocks; and a fixing ring extending in a radial direction from one side of the fixing post, wherein the fixing ring may contact an upper surface of a unit block located on an upper side of the plurality of unit blocks and be coupled by a magnet.

An operation block according to another embodiment of the present invention includes a fixed column; a plurality of unit blocks stacked along the longitudinal direction of the fixing post and rotatably coupled to the fixing post; and a plurality of magnets disposed inside the unit block at regular intervals in the circumferential direction, aligned in the stacking direction of the unit block when the unit block rotates, and providing bonding force between the plurality of stacked unit blocks. Including, the unit block is formed in an N-gon, and the plurality of magnets may be spaced apart by an angle of 360/N with respect to the fixing pillar.

The calculation block according to another embodiment of the present invention further includes a sign composed of a plurality of carved panels formed to correspond to one side of the N-gonal shape of the unit block, and the plurality of carved panels have the N-shaped shape. connected in a structure that can be folded or developed along, and the sign may be configured to surround an outer circumferential surface of the unit block.

According to an embodiment of the present invention, the following effects can be achieved.

First, a unit block is based on a 10-sided three-dimensional figure, and a through hole into which a fixed pillar can be inserted is provided at the center of the unit block, so that it can rotate around the fixed pillar.

Second, the fixed column can reinforce the rotational stability of the unit block.

Third, a plurality of magnets are disposed at specific positions of the unit block, so that postures can be maintained during coupling and rotation of each unit block.

A plurality of magnets can maintain a required degree of bonding force between unit blocks, so various uses are possible. Here, the required degree of coupling force may mean a coupling force sufficient to maintain a constant coupling shape during rotation of a plurality of unit blocks.

Fourth, since a plurality of magnets are mounted at a certain angle of the unit block, it is possible to obtain a rotational feeling (clicking feeling) generated by a mechanical gear method without loosening even when the number of rotations of the unit block increases.

For example, a plurality of magnets are disposed near the center and at each corner of the decagonal unit block to provide bonding force between the unit blocks. The magnets placed at a certain angle (36 degrees) provide a constant resistance to maintain the posture along with a clicking feeling every 36 degrees of rotation. Also, when changing the number of calculation blocks, the entire unit block can maintain the shape of a 10-gon.

Fifth, the existing blocks are used for one purpose, such as for calculation and model making, but the calculation block according to this embodiment uses one block set by replacing signs to perform various calculations, colors, games, etc. can be utilized

1 is a perspective view showing how a sign is mounted on a calculation block according to the present invention.
FIG. 2 is a conceptual diagram showing the sign of FIG. 1 laid out on a flat surface.
FIG. 3 is a perspective view showing a calculation block from which signs are removed from FIG. 1 .
FIG. 4 is a bottom view showing the unit block in FIG. 3 viewed from below.
5 is a conceptual diagram showing a state in which a fixing ring is coupled to a central pillar in FIG. 3 .
6 is a conceptual diagram showing the configuration of a calculation block according to another embodiment of the present invention.

Hereinafter, a calculation block according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In the following description, descriptions of some components may be omitted to clarify the characteristics of the present invention.

1. Definition of terms

It is understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but other elements may exist in the middle. It should be.

On the other hand, when an element is referred to as “directly connected” or “directly connected” to another element, it should be understood that no other element exists in the middle.

Singular expressions used herein include plural expressions unless the context clearly dictates otherwise.

An axial direction used in the following description may refer to a longitudinal direction of a fixing pillar vertically disposed in a vertical direction.

The radial direction used in the following description may mean a direction perpendicular to the aforementioned axial direction.

The diameter of a polygon used in the following description may refer to the diameter of a circle passing through all vertices of the polygon for convenience in describing the size of the polygon.

The circumferential direction used in the following description may mean a circumferential direction of a circle passing through all vertices of a polygon.

2. Description of the configuration of the calculation block 100 according to an embodiment of the present invention

1 is a perspective view showing how a sign 140 is mounted on a calculation block 100 according to the present invention.

FIG. 2 is a conceptual diagram showing the sign 140 of FIG. 1 laid out on a flat surface.

FIG. 3 is a perspective view showing the calculation block 100 in FIG. 1 from which the sign 140 is removed.

FIG. 4 is a plan view showing the unit block 110 in FIG. 3 viewed from below.

FIG. 5 is a conceptual view showing a state in which the fixing ring 131 is coupled to the central pillar in FIG. 3 .

The present invention relates to a calculation block (100).

The arithmetic block 100 of the present invention can be used as a arithmetic teaching aid, a coloring teaching aid, and a toy.

The present invention includes a unit block 110 and a fixing post 130.

At least one unit block 110 may be provided. In this embodiment, a plurality of unit blocks 110 are provided. For example, six unit blocks 110 may be provided. However, the unit block 110 is not limited to the above number.

The unit block 110 may be formed in the shape of a polygonal or circular column having a smaller height than its diameter. In this embodiment, the unit block 110 shows a shape formed in the form of a polygonal (N-gonal, N is a natural number of 3 or greater) column. For example, the unit block 110 may be a 10-sided pillar.

The unit block 110 has an N-shaped upper surface 111 having N corners, an N-shaped lower surface 112 having N corners, and a vertex of the upper surface 111 and a vertex of the lower surface 112. An outer circumferential surface 113 having N edges connected thereto may be provided.

The outer circumferential surface 113 of the unit block 110 has N side portions. Each side portion may be formed in a planar shape. Each side portion is divided by N corners formed on the outer circumferential surface (113). The N side parts are continuously connected along the outer circumferential surface 113 of the unit block 110 .

Two adjacent side surfaces along the circumferential direction of the unit block 110 meet each other at a predetermined angle.

The unit block 110 may be composed of N pieces 114 . The piece 114 of the unit block 110 may be formed in a triangular prism shape. The N pieces 114 are continuously connected along the outer circumferential surface 113 of the unit block 110 . The N pieces 114 may be of the same size or volume.

A side surface of the unit block 110 may form an outer surface of the piece 114 of the unit block 110 .

The plurality of unit blocks 110 may be used in a form in which all blocks are combined or some blocks may be separated to be used as games or arithmetic teaching aids.

The unit block 110 may be configured to be rotatable around the fixing post 130 .

A through hole 115 is formed at the center of the unit block 110 to pass through the fixing column 130 in the longitudinal direction.

The fixing pillar 130 may be formed in a circular pillar shape having a relatively long length compared to a diameter.

The fixing post 130 may be a writing instrument. In this embodiment, the fixing post 130 shows a state implemented with a pencil. A pencil used as the fixing post 130 may be used when making a memo during calculation of the calculation block 100 .

The fixing post 130 may pass through the through hole 115 of the unit block 110 . The fixing post 130 may be inserted through the through hole 115 and coupled to the unit block 110 . The through hole 115 may be formed in a circular or cylindrical shape.

The diameter of the through hole 115 is formed to correspond to the diameter of the fixing post 130 . Here, that the diameters correspond means that the diameters are the same or that the diameters are similar to each other to the extent that a minute difference in diameter can be tolerated so that they can be coupled to each other.

The through hole 115 allows the unit block 110 to move up and down along the longitudinal direction of the fixing post 130 or to rotate around the fixing post 130, but the unit block 110 is It is possible to limit movement in the radial direction around .

A plurality of unit blocks 110 may be stacked in a vertical direction. The fixing post 130 may be inserted through the through holes 115 of the plurality of unit blocks 110 . The fixing post 130 may connect the plurality of stacked unit blocks 110 .

The fixing post 130 may be disposed vertically in a vertical direction.

The plurality of unit blocks 110 may be independently rotated around the fixing post 130 .

A plurality of unit blocks 110 adjacent along the longitudinal direction of the fixing pillar 130 may rotate relative to each other.

The plurality of unit blocks 110 may be configured to be coupled to each other while being rotated at a certain angle.

To this end, each unit block 110 includes a plurality of magnets 120 . The plurality of magnets 120 may be spaced apart from each other at regular intervals in the circumferential direction inside the unit block 110 . The plurality of magnets 120 may be spaced apart at an angle of 360 degrees/N along the circumferential direction of the unit block 110 .

For example, the plurality of magnets 120 may be spaced apart from each other at 36 degree (360/10) intervals in the case of the octagonal unit block 110 .

Each of the plurality of magnets 120 may be formed in a circular or cylindrical shape.

A plurality of magnet receiving holes 123 are formed in the unit block 110 . The magnet receiving hole 123 may be formed to pass through the unit block 110 in the vertical direction or may be formed concavely at a predetermined depth in the upper surface 111 and the lower surface 112 in the axial direction of the unit block 110. In this embodiment, the magnet receiving hole 123 is formed concavely on the upper surface 111 and the lower surface 112 of the unit block 110, respectively.

The plurality of magnets 120 are mounted in the plurality of magnet receiving holes 123, respectively.

At least one magnet receiving hole 123 may be provided in each piece 114 of the unit block 110 . In this embodiment, two magnet receiving holes 123 are provided in each piece 114 of the unit block 110.

The magnet receiving hole 123 may be disposed between two adjacent corner ends of a triangle inside each piece 114 of the unit block 110 .

Each piece 114 of the unit block 110 may include a first magnet 121 and a second magnet 122 .

The first magnet 121 may be disposed adjacent to the outer circumferential surface 113 of the unit block 110 . The first magnet 121 may be disposed between the outer edge and the right edge of each piece 114 .

The second magnet 122 may be disposed adjacent to the through hole 115 of the unit block 110 . The second magnet 122 may be disposed between the left and right corners of each piece 114 with the inner vertex angle interposed therebetween.

According to this configuration, when the plurality of first magnets 121 and/or the plurality of second magnets 122 are overlapped or aligned in the stacking direction of the unit block 110 during rotation of each unit block 110 forces act on each other.

The first magnet 121 and/or the second magnet 122 is between the plurality of unit blocks 110 adjacent in the axial direction or the longitudinal direction of the fixed pillar 130 when the plurality of unit blocks 110 are rotated at a certain angle. It is possible to provide a binding force, for example, a magnetic force (attractive force) of a magnet.

The plurality of unit blocks 110 may be coupled at a certain angle by attraction between magnets. A plurality of magnets may maintain postures during coupling and rotation of each unit block 110 .

The first magnet 121 may perform a main role of providing bonding force between the unit blocks 110 , and the second magnet 122 may play an auxiliary role of providing bonding force between the unit blocks 110 . The second magnet 122 may be selectively applied.

A fixing ring 131 may be provided on the fixing post 130 . The fixing ring 131 may be formed to protrude radially from the fixing post 130 or may be coupled to the fixing post 130 . In this embodiment, the fixing ring 131 is coupled to the fixing post 130.

The fixing ring 131 may be formed in a circular or disc shape. The upper and lower surfaces of the fixing ring 131 may be formed in a flat shape. The fixing ring 131 includes a plurality of magnet insertion parts 132 . A plurality of magnets 133 may be inserted into and coupled to the plurality of magnet insertion parts 132 .

The magnet insertion part 132 and the magnet 133 of the fixing ring 131 may be formed in a shape corresponding to each other, for example, circular.

The plurality of magnet inserts 132 may be spaced apart from each other at regular intervals along the circumferential direction of the fixing ring 131 .

The plurality of magnet insertion parts 132 may be disposed to overlap each other in the stacking direction of the unit block 110 with the magnet receiving hole 123 to which the second magnet 122 of the unit block 110 is coupled.

According to this configuration, the magnet 133 of the fixing ring 131 is arranged so as to overlap the second magnet 122 of the unit block 110 and the stacking direction of the unit block 110 when each unit block 110 rotates. When aligned or aligned, the mutual attraction between the magnets can further enhance the rotational stability of the unit block 110.

The arithmetic block 100 of the present invention further includes a signpost 140.

The sign 140 may be composed of a plurality of carved panels 141 . In this embodiment, the number of pieces 141 may be 10.

A plurality of piece panels 141 may be connected in series. A plurality of piece panels 141 connected in series are provided as a set and can be mounted on each unit block 110 . In this embodiment, the plurality of carved panels 141 may be provided in 6 sets.

Each of the plurality of piece panels 141 may be composed of a magnet panel. The plurality of carved panels 141 may be detachably mounted along the outer circumferential surface 113 of the unit block 110 .

The carved panel 141 may be formed in a shape corresponding to each side of the outer circumferential surface 113 of the unit block 110 . Here, the corresponding shape may mean the same shape or a similar shape. In this embodiment, the shape of the sign 140 shows a rectangular shape.

The carved panel 141 of the sign 140 may be formed to be smaller than or equal to each side of the outer circumferential surface 113 of the unit block 110 .

The carved panel 141 of the sign 140 may be folded along the angular shape of the outer circumferential surface 113 of the unit block 110 or developed in a flat shape.

The plurality of signs 140 may be composed of products capable of arithmetic operations, colors, games, and the like.

According to this configuration, it is possible to expand the unit blocks 110 of the same shape by the required number, and by replacing different types of signs 140 such as calculation, color, and game, calculation and color using one block set. , can be used in a variety of ways, such as games.

Timers or ring bells can be blocked. Blocked timers or ring bells may be coupled to the fixed pillar 130 together with the unit block 110 .

According to this configuration, the timer or ring bell is assembled together with the unit block 110 and has the advantage of being easy to store.

3. Description of the configuration of the calculation block 200 according to another embodiment of the present invention

6 is a conceptual diagram showing the configuration of a connection block 200 according to another embodiment of the present invention.

This embodiment is different from the above-described embodiments of FIGS. 1 to 5 in that a support is further provided.

The support is configured to partially support the fixing post 130 .

The support may be composed of a base plate and a center support.

The base plate has a certain thickness and diameter (area). The base plate has rigidity capable of supporting the fixing pillar 130 . The base plate may be formed in various shapes such as a circular shape or a polygonal shape.

The central support portion may extend vertically upward from the center of the base plate.

A column receiving groove may be formed inside the central support portion. The lower part of the fixing pillar 130 may be inserted into the pillar receiving groove and coupled thereto.

According to this configuration, the support can improve rotational stability of the unit block 110 by supporting the lower portion of the fixing pillar 130 .

Since other components are the same as or similar to those of the above-described embodiments of FIGS. 1 to 5 , redundant descriptions thereof will be omitted.

Therefore, according to the present invention, the unit block 110 is based on a decagonal three-dimensional figure, and the center of the unit block 110 is provided with a through hole 115 into which the fixing pillar 130 can enter, and is fixed. It is rotatable about the pillar 130.

Also, the fixing post 130 may reinforce rotational stability of the unit block 110 .

Since the plurality of magnets are disposed at specific positions of the unit block 110, postures can be maintained during coupling and rotation of each unit block 110.

A plurality of magnets can maintain a necessary degree of bonding force between the unit blocks 110, so that various uses are possible. Here, the required degree of coupling force may mean a coupling force sufficient to maintain a constant coupling shape during rotation of the plurality of unit blocks 110 .

Since the plurality of magnets are mounted at a certain angle of the unit block 110, it is possible to obtain a rotational feeling (clicking feeling) generated by a mechanical gear method without loosening even when the number of rotations of the unit block 110 increases.

For example, a plurality of magnets are disposed near the center and at each corner of the decagonal unit block 110 to provide bonding force between the unit blocks 110 . The magnets placed at a certain angle (36 degrees) provide a constant resistance to maintain the posture along with a clicking feeling every 36 degrees of rotation. In addition, when the number of unit blocks 110 is changed, the entire unit block 110 may maintain the shape of a octagon.

In addition, the existing block is used for one purpose, such as for calculation and model making, but the calculation block 100 according to this embodiment replaces the sign 140 to calculate using one block set, It can be used in various ways such as colors and games.

100: calculation block 110: unit block
111: upper surface 112: lower surface
113: outer circumference 114: engraving
115: through hole 120: magnet
121: first magnet 122: second magnet
123: magnet receiving hole 130: fixed pillar
131: fixing ring 132: magnet insertion part
133: magnet 140: sign
141: engraving panel 200: calculation block
210: support 211: base plate
212: center support 213: column receiving groove

Claims (20)

a plurality of unit blocks having through holes penetrating in an axial direction at a central portion;
a fixing post passing through the through hole and connecting the plurality of unit blocks stacked in the axial direction;
a sign mounted on an outer circumferential surface of the unit block to surround the outer circumferential surface of the unit block;
a plurality of magnets disposed inside the unit block at regular intervals in the circumferential direction, aligned in the stacking direction of the unit block when the unit block rotates, and providing bonding force between the plurality of stacked unit blocks; and
It includes a fixing ring mounted on the fixing post and fixed to one side of the unit block, and both sides facing opposite to the axial direction are each formed as a plane,
The plurality of magnets,
a plurality of first magnets spaced apart from the through hole by a first distance in a radial direction and disposed adjacent to an outer circumferential surface of the unit block; and
And a plurality of second magnets spaced apart from the through hole by a second distance shorter than the first distance in a radial direction and disposed adjacent to the through hole,
The fixing ring,
an opening formed to correspond to the through hole through which the fixing pillar passes; and
A plurality of magnets spaced apart from the opening by a predetermined distance in the radial direction, spaced apart from each other at regular intervals along the circumferential direction, and disposed overlapping with the second magnet in the stacking direction of the unit block, respectively,
The sign is
It is composed of a plurality of sculptural panels made of magnets and formed in a shape corresponding to one surface of the unit block formed in an N-angle and in surface contact with the outer circumferential surface of the unit block,
The number of sides of the N-gon and the number of the carved panels correspond to each other,
Each of the plurality of sculptural panels is disposed in a line along the circumferential direction of the unit block, and is connected to be folded or unfolded.
According to claim 1,
Each of the plurality of unit blocks rotates independently around the fixed pillar,
The plurality of unit blocks are coupled by magnetic force between the plurality of magnets aligned in the axial direction when rotating.
According to claim 1,
The plurality of magnets are composed of at least one magnet for each region having the same area when the unit block is viewed in the axial direction.
According to claim 1,
The plurality of magnets are disposed at a constant distance in a radial direction from the through hole.
According to claim 1,
The magnet is an operation block formed in a cylindrical or circular shape.
According to claim 1,
The through hole and the fixing pillar each have a diameter corresponding to each other and are formed in a circular shape.
According to claim 1,
The unit block is an arithmetic block formed in a 10-gon.
According to claim 1,
An outer circumferential surface of the unit block includes a plurality of planes continuously arranged in a circumferential direction, and two planes adjacent in the circumferential direction form a predetermined angle.
According to claim 1,
The fixing column is a calculation block composed of a writing tool. delete delete delete delete delete delete delete delete delete delete delete

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