[(0,1),(1,2),(0,3),(2,4),(4,5),(1,5),(4,6),(5,7),(3,7),(6,8),(2,8),(8,9),(6,10),(9,10),(3,11),(9,11),(11,12),(7,12),(10,13),(12,14),(13,15),(15,16),(14,16),(16,17),(15,18),(13,19),(14,19),(18,20),(18,21),(17,22),(20,22),(20,23),(23,24),(21,25),(17,26),(24,26),(22,27),(19,28),(28,29),(25,29),(24,30),(28,30),(30,31),(27,32),(25,33),(27,33),(33,34),(34,35),(31,35),(26,36),(21,36),(31,37),(32,38),(36,39),(39,40),(37,41),(41,42),(40,43),(29,44),(23,45),(42,45),(44,46),(45,47),(46,47),(46,48),(47,49),(32,50),(49,51),(43,52),(40,53),(50,54),(34,54),(39,55),(54,56),(52,56),(55,57),(43,58),(55,58),(57,59),(51,60),(44,61),(53,62),(56,63),(58,64),(41,65),(57,66),(42,67),(35,68),(53,69),(48,70),(37,71),(48,72),(52,73),(50,74),(38,75),(49,76),(38,77),(51,78)]
[(0,1),(1,2),(0,2),(2,3),(1,3),(3,4),(4,5),(5,6),(5,7),(6,7),(4,8),(6,8),(7,9),(9,10),(8,10),(9,11),(11,12),(12,13),(13,14),(11,15),(14,16),(10,17),(17,18),(14,18),(18,19),(16,20),(12,21),(15,22),(13,23),(20,24),(22,25),(21,25),(21,26),(22,27),(24,27),(23,28),(16,29),(27,30),(15,30),(17,31),(28,32),(23,33),(26,33),(30,34),(34,35),(19,35),(20,36),(29,37),(31,38),(36,38),(28,39),(39,40),(29,41),(25,42),(31,42),(36,43),(37,43),(33,44),(34,44),(35,45),(38,46),(19,47),(43,48),(44,48),(41,49),(47,49),(42,50),(24,50),(46,51),(46,52),(49,52),(48,53),(53,54),(51,55),(52,55),(40,56),(56,57),(57,58),(55,59),(57,60),(51,61),(39,62),(45,63),(58,64),(47,65),(41,66),(40,67),(32,68),(54,69),(32,70),(54,71),(53,72),(37,73),(58,74),(45,75),(26,76),(56,77),(50,78)]
