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