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