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