[(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),(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)]
