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