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