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