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