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7FF4: Door/window status flags
Used by the routine at 7040. Bit set=open, bit reset=closed.
Bit Door/window
0 Left study door
1 Right study door
2 Science Lab storeroom door
3 Boys' skool door
4 Skool gate
5 Drinks cabinet door
6 Top-floor window
7 Middle-floor window
7FF4 DEFB $00
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