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