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