For `ape::dist.nodes()`, how can one match the output matrix rows/columns with 
the node IDs in the tree (eg., the tip.labels)? I cannot just use 
`ape::cophenetic()` in my particular situation. The docs for 
`ape::dist.nodes()` state:

```
… in the case of dist.nodes, the numbers of the tips and the nodes (as given by 
the element edge).
```

… but tree$edge doesn’t provide any direct info about which nodes are internal 
vs external and how the external tip labels map to the tree$edge matrix. 

Thanks,
Nick
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