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