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