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