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