[(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),(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)]
