[(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),(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)]
