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Simple cube
M        Center of an edge
R        Corner point
X        Center of a face
Face-centered cubic
K        Middle of an edge joining two hexagonal faces
L        Center of a hexagonal face
U        Middle of an edge joining a hexagonal and a square face
W        Corner point
X        Center of a square face
Body-centered cubic
H        Corner point joining four edges
N        Center of a face
P        Corner point joining three edges
Hexagonal
A        Center of a hexagonal face
H        Corner point
K        Middle of an edge joining two rectangular faces
L        Middle of an edge joining a hexagonal and a rectangular face
M        Center of a rectangular face

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