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