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