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