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