Routines
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CDD3: Object starts below the union
Used by the routine at overlap_x_decided.
Part of test_overlap_obj. The object's bottom row is below the union's; it overlaps if the gap is less than its own height.
obj_starts_below CDD3 NEG rows by which it starts below, against its height
CDD5 CP (IY+$19)
CDD8 JR overlap_y_decided carry means overlap
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