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