version 2/110428 by Mike Ciul
Example: * Exclusion - Excluding one room in a region.
Include Conditional Backdrops by Mike Ciul.
Living room is a room. Study is east of living room. Kitchen is south of living room. Yard is north of living room.
The house is a region. Living room, study, and kitchen are in the house.
The rug is a conditional backdrop. The rug is not scenery.
Backdrop condition for the rug:
if the location is the kitchen, it is absent;
if the location is in the house, it is present.
Test me with "e / w / s / n / n / s".