| 14 | 14 | Another possibility would be to use the definition found on Wikipedia, namely that a simple path must not have ''any'' repeated vertices, and that a "simple cycle" is a path whose first vertex is its last vertex but has no other vertex repetitions. In this case the function should exclude both paths of the form `[a, b, c, b]` and paths of the form `[b, c, b]`. But I don't see that this is very useful. The function allows you to specify sets of starting and ending points for the paths you want returned, and if you specify non-disjoint sets, you are likely asking for cycles to be included. |
