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