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 Shadow table
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 Shadow side                                     Binary        Decimal
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 no sides shadowed                               0000           0
 side 1 (top)                                    0001           1
 side 2 (right)                                  0010           2
 side 1 & 2 (top & right)                        0011           3
 side 3 (bottom)                                 0100           4
 side 1 & 3 (top & bottom)                       0101           5
 side 2 & 3 (right & bottom)                     0110           6
 side 2 & 3 (top, right & bottom)                0111           7
 side 4 (left)                                   1000           8
 side 1 & 4 (top & left)                         1001           9
 side 2 & 4 (right & left)                       1010          10
 side 1,2 & 4 (top, right & left)                1011          11
 side 3 & 4 (bottom & left)                      1100          12
 side 1,3 & 4 (top, bottom & left)               1101          13
 side 2,3 & 4 (right, bottom & left)             1110          14
 side 1,2,3 & 4 (all sides)                      1111          15
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