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