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