[(0,1),(0,2),(2,3),(1,4),(2,4),(3,5),(1,6),(5,7),(7,8),(3,9),(8,9),(8,10),(5,11),(9,12),(11,13),(4,14),(12,15),(7,16),(10,17),(12,18),(11,19),(10,20),(6,21),(6,22)]
[(0,1),(1,2),(0,3),(2,3),(3,4),(1,4),(2,5),(4,6),(5,7),(6,8),(8,9),(9,10),(6,11),(10,12),(9,13),(12,14),(10,15),(8,16),(7,17),(5,18),(11,19),(12,20),(11,21),(7,22)]
