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