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