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