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