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