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