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B9D8: Walking guard's headings
Four handlers indexed by the heading in bits 0 and 1 of +13, in the order they are walked: tcdev's names call -X west, +Y north, +X east and -Y south.
guard_NSEW_tbl B9D8 DEFW guard_W 0: heading -X
B9DA DEFW guard_N 1: heading +Y
B9DC DEFW guard_E 2: heading +X
B9DE DEFW guard_S 3: heading -Y
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