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