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54533: Unused routine
This routine is not used. It is assumed, since this routine flows into the routine at 54539, that this unused routine was also intended to deal with room connectivity. As there are routines to deal with vertical and horizontal (left-right) connectivity, it is possible that this routine was originally intended to handle horizontal (forward-back) connectivity.
See also unused routine at 54499.
54533 LD IY,(34252) Load IY with address of unused data block (09)
54537 JR 54546 Load B with index of room, as related to room of index D via data in unused data block (09)
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