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