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