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