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