Solution: (0,0,90)(0,1,180)(1,0,0)(1,1,270) +---------++---------+ | || | | || | | || | | || | | ###||### | | # || # | | # || # | | # || # | | # || # | +---------++---------+ +---------++---------+ | # || # | | # || # | | # || # | | # || # | | ###||### | | || | | || | | || | | || | +---------++---------+