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