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