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