Data
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B108: The step in U and V for each way a creature can face
Four pairs of a step in U and a step in V, indexed by bit 6 of the flags (the mirror bit) times two plus bit 0 of the graphic (STEP_FROM_FACING).
FACING_STEPS B108 DEFB $FF,$00 Unmirrored, graphic even: minus U; odd: plus U. Mirrored, even: plus V; odd: minus V
B10A DEFB $01,$00
B10C DEFB $00,$01
B10E DEFB $00,$FF
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