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C8E9: Directional control: face W
Used by the routine at directional_pick.
As chk_facing_N for W, code 0: left from N, right from S, and from E a right turn to S now and another to W on the next frame.
chk_facing_W C8E9 CALL get_sprite_dir facing W is code 0
C8EC AND A
C8ED JR chk_facing_sw_result
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