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