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