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