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