[(0,1),(0,2),(2,3),(1,3),(2,4),(3,4),(4,5),(5,6),(6,7),(1,7),(7,8),(8,9),(6,10),(8,11),(11,12),(9,13),(13,14),(10,14),(14,15),(12,15),(10,16),(12,17),(17,18),(5,19),(18,20),(11,21),(18,22),(17,23),(9,24),(13,25),(16,26),(15,27),(16,28)]
[(0,1),(0,2),(2,3),(1,3),(2,4),(3,4),(4,5),(5,6),(6,7),(1,7),(7,8),(8,9),(6,10),(8,11),(11,12),(9,13),(13,14),(10,14),(14,15),(12,15),(10,16),(12,17),(17,18),(5,19),(18,20),(11,21),(18,22),(17,23),(9,24),(13,25),(16,26),(15,27),(16,28)]
