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