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