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