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