Stack of one face and its adjacent slice: right, left, up, down, front and back
Naturally, direction follow face's.
stack of middle slice and right face
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r | |
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stack of middle slice and left face
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l |  |
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stack of equator slice and up face
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u |  |
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stack of equator slice and down face
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d |  |
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stack of standing slice and front face
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f |  |
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stack of standing slice and back face
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b |  |
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