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