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