Data
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DE6A: Routines to trim a step at the walls, by facing (MOVE_CLIPPED)
Each finds the town cells that the record's front edge is in, and will be in after the step, and tests the record against every box of each cell's type (the box lists, through BOX_TABLE).
MOVE_TABLE DE6A DEFW CLIP_PLUS_V Facing +V
DE6C DEFW CLIP_PLUS_U Facing +U
DE6E DEFW CLIP_MINUS_V Facing -V
DE70 DEFW CLIP_MINUS_U Facing -U
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