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