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