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