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