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