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