[(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),(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)]
