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