“…(2, 1), (2, 3), (2,6), (3, 0), (3,7), (3,4), (4, 0), (4, 1), (4, 3), (4, 8), (5, 1), (5,10), (5,9), (5,20), (6,2), (6,11), (6,12), (6,13), (7,3), (7,14), (7,15), (7,16), (8,4), (8,17), (8,18), (8,19), (9,5), (9,10), (9,20), (10,5), (10,9), (10,11), (11,6), (11,12), (11,<...…”