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