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