I have a tree structure where the same point shows up on different levels, 
but I want to treat these as distinct points on the graph. Currently the 
only workaround is to add an integer to each of the points to distinguish 
them. Is there a way to change the label on the vertex but keep the points 
differentiated in the dictionary?

We know an alternate way to construct a directed graph is to call DiGraph 
on an adjacency matrix, but as it stands I only see a way to label vertices 
when we feed the function a dictionary. I am wondering if it is possible to 
label the rows of the adjacency matrix (which represent one vertex each) so 
that DiGraph outputs a graph with vertices labelled something other than 0, 
..., n. I think this would fix the issue, since I'd be able to give 
different rows the same label. 

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