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