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C7A9: How to nudge, by the arch's direction
Four words indexed as the player's facing would be; an arch only ever produces 0 (east or west wall, not mirrored) or 2 (north or south, mirrored).
adj_arch_tbl C7A9 DEFW adj_ew East or west arch: nudge along y
C7AB DEFW adj_ew
C7AD DEFW adj_ns North or south arch: nudge along x
C7AF DEFW adj_ns
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