Listing 2. Hole description file (holes/southwall.holes)
for the south wall.

# Front door (floor to 7 ft, starts 2.5 ft 
# from wall's origin, 3 ft wide)
0 7 2.5 3:d
# window (3ft to 6ft from the floor, starts
# 9 ft along the wall, 3 ft wide)
3 6 9 3:w