[(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),(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)]
