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