[(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),(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)]
