Slices between 2 opposite faces: Middle (between Left and Right), Equator (between Up and Down) and Standing (between Front and Back)
Direction follows Left for Middle, Down for Equator and Front for Standing.
slice between right and left, following left face
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M | |
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slice between up and down, following down face
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E |  |
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slice between front and back, following front face
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S |  |
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