[(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),(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)]
