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