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