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