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