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