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C68D: A step in each direction
Four routine addresses, one per facing, used through the jump at the end of CALC_PLYR_DUV. Each adds 3 to, or takes 3 from, the U or V step.
WALK_STEP_TBL C68D DEFW STEP_U_DOWN Facing 0: U - 3; 1: U + 3; 2: V + 3; 3: V - 3
C68F DEFW STEP_U_UP
C691 DEFW STEP_V_UP
C693 DEFW STEP_V_DOWN
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