[(0,1),(1,2),(0,3),(1,3),(3,4),(2,5),(5,6),(4,7),(5,8),(4,9),(8,10),(7,11),(11,12),(8,13),(10,13),(6,14),(14,15),(9,16),(7,17),(16,18),(18,19),(12,20),(6,21),(20,22),(13,23),(22,24),(22,25),(20,26),(9,27),(12,28),(15,29),(14,30),(17,31),(15,32),(21,33),(17,34),(21,35),(11,36),(18,37),(19,38),(19,39),(2,40),(10,41),(16,42)]
[(0,1),(0,2),(2,3),(2,4),(1,5),(1,6),(5,7),(6,8),(4,8),(8,9),(7,10),(10,11),(3,12),(3,13),(10,14),(14,15),(15,16),(9,16),(9,17),(5,18),(4,19),(12,20),(11,21),(18,22),(22,23),(11,24),(17,25),(13,26),(19,27),(13,28),(16,29),(7,30),(20,31),(17,32),(15,33),(12,34),(22,35),(21,36),(18,37),(14,38),(21,39),(6,40),(20,41),(19,42)]
