[(0,1),(0,2),(2,3),(2,4),(1,4),(1,5),(5,6),(5,7),(7,8),(3,9),(7,10),(9,11),(6,12),(8,13),(12,14),(3,15),(15,16),(11,17),(4,18),(18,19),(16,20),(8,20),(14,21),(10,21),(17,22),(21,23),(14,23),(13,24),(23,25),(19,25),(20,26),(26,27),(25,28),(28,29),(16,30),(10,31),(11,32),(19,33),(12,34),(22,35),(24,36),(18,37),(27,38),(15,39),(13,40),(6,41),(28,42),(9,43),(17,44),(24,45),(27,46),(26,47),(22,48)]
[(0,1),(1,2),(1,3),(2,4),(4,5),(5,6),(6,7),(4,8),(2,8),(6,9),(7,10),(9,10),(3,11),(3,12),(9,13),(8,13),(12,14),(11,15),(13,16),(15,17),(12,18),(18,19),(18,20),(16,21),(17,22),(11,23),(21,23),(16,24),(22,24),(20,25),(5,26),(19,27),(20,28),(17,29),(25,30),(14,31),(21,32),(26,33),(26,34),(24,35),(10,36),(28,37),(7,38),(19,39),(27,40),(23,41),(28,42),(25,43),(15,44),(14,45),(0,46),(27,47),(22,48)]
