This function finds paths of nodes in a tree. The nodes can be internal and/or terminal (i.e., tips).
an object of class
integers giving node or tip numbers.
By default, this function returns all the paths from the root to each
tip of the tree. If both arguments
specified, the shortest path of nodes linking them is returned.
a list of vectors of integers (by default), or a single vector of integers.
1 2 3
[]  3 1 []  3 2  1 3 2
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