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