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