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