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