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