+----+ | x | 1 First Floor | +----+----+ +----+ +----+----+ | | | | | +----+----+ + +-----+----+ +----+ | | | | | | + +----+ + + +-o--+ + | | | | / | | | + +----+ +----+ + | + + | | | x +----+ | | | | + | | | | |x | | +----+ +----+----+ +----+----+----+ | | | | | +----+----+----+ + +----+ + | | | | | +----+ +-----+----+----+ + | | | | | | + +----+----+ + +----+----+