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Block-cut tree graph

`tree = bctree(G)`

```
[tree,ind]
= bctree(G)
```

returns the block-cut tree of graph `tree`

= bctree(`G`

)`G`

, such that each node in
`tree`

represents either a biconnected component or cut
vertex of `G`

. A node representing a cut vertex is
connected to all nodes representing biconnected components that contain that cut
vertex.