+------+----+----+----+----+----+----+----+----+----+----+-----+----+ | 12 | | | | | | | | | | | | | +------+----+----+----+----+----+----+----+----+----+----+-----+----+ | 13 | | | | | | | | | | | | | +------+----+----+----+----+----+----+----+----+----+----+-----+----+ | 14 | | | | | | | | | | | | | +------+----+----+----+----+----+----+----+----+----+----+-----+----+ | 15 | | | | | | | | | | | | | +------+----+----+----+----+----+----+----+----+----+----+-----+----+ | 16 | | | | | | | | | | | | | +------+----+----+----+----+----+----+----+----+----+----+-----+----+ | 17 | | | | | | | | | | | | | +------+----+----+----+----+----+----+----+----+----+----+-----+----+ | 18 | | | | | | | | | | | | | +------+----+----+----+----+----+----+----+----+----+----+-----+----+ | 19 | | | | | | | | | | | | | +------+----+----+----+----+----+----+----+----+----+----+-----+----+ | 20 | | | | | | | | | | | | | +------+----+----+----+----+----+----+----+----+----+----+-----+----+ | 21 | | | | | | | | | | | | | +------+----+----+----+----+----+----+----+----+----+----+-----+----+ | 22 | | | | | | | | | | | | | +------+----+----+----+----+----+----+----+----+----+----+-----+----+ | 23 | | | | | | | | | | | | | +------+----+----+----+----+----+----+----+----+----+----+-----+----+ | 24 | | | | | | | | | | | | | +------+----+----+----+----+----+----+----+----+----+----+-----+----+ | 25 | | | | | | | | | | | | | +------+----+----+----+----+----+----+----+----+----+----+-----+----+ | 26 | | | | | | | | | | | | | +------+----+----+----+----+----+----+----+----+----+----+-----+----+ | 27 | | | | | | | | | | | | | +------+----+----+----+----+----+----+----+----+----+----+-----+----+ | 28 | | | | | | | | | | | | | +------+----+----+----+----+----+----+----+----+----+----+-----+----+ | 29 | | | | | | | | | | | | | +------+----+----+----+----+----+----+----+----+----+----+-----+----+ | 30 | | | | | | | | | | | | | +------+----+----+----+----+----+----+----+----+----+----+-----+----+ | 31 | | | | | | | | | | | | | +------+----+----+----+----+----+----+----+----+----+----+-----+----+