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-# Internal representation of the cube
-
-The plan (TODO) is to have multiple implementations: some that
-take advantage of advanced CPU instructions (SIMD) and a fallback
-"array" representation that works on any architecture.
-
-# Array representation (fallback)
-
-In this implementation of the cube.h interface, the cube is represented
-by two arrays of 8-bit unsigned integers, one for centers and one for
-corners.  The 4 leas-significant digits of each bit determine the piece,
-the other 4 are used for orientation or kept to 0.
-
-Edges:
-        xxxopppp (x = unused, o = orientation, p = piece)
-
-Corners:
-        xooxpppp (x = unused, o = orientation, p = piece)
-
-The two bits for CO are shifted to make it possible to perform mod 3
-operations (sum, inverse) using only addition and bitwise operators.
-See below for details.
-
-The third bit is needed because x+y+1 can exceed 4.