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