# _r = [
# (15, 3), (0, 15), (8, 0), (2, 8), (11, 9), (12, 11), (3, 12), (13, 8), (10, 13),
# (17, 10), (7, 17), (1, 13), (16, 1), (12, 16), (5, 11), (10, 5), (6, 2), (14, 5),
# (4, 14), (4, 9), (14, 7), (15, 16), (0, 1), (17, 6)]
#
# _n = [(517, 408), (517, 313), (320, 408), (651, 408), (518, 81), (518, 250), (320, 239), (389, 122), (389, 408),
# (651, 81), (389, 250), (651, 250), (651, 313), (389, 313), (518, 122), (580, 408), (580, 313), (389, 239)]