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