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36966: Close the Trap Door if Berk is not in room 1 and Drutt is in room 4 (level 1)
Used by the routine at 36887.
36966 LD A,(43593) If Berk's current room (level 1) is 1 (i.e. Trap Door room)...
36969 CP 1 ...
36971 RET Z ...then return
36972 LD A,(43671) If Drutt's current room is not 4 (room at bottom of Trap Door shaft)...
36975 CP 4 ...
36977 RET NZ ...then return
36978 SET 3,(IX+9) Set Berk-and-Drutt-through-Trap-Door flag
36982 JR 36996 Close the Trap Door and return
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