# get graph combinatorial embedding from position of vertices

Lets say I have a graph and set positions for the veritces. Is it somehow possible to get the combinatorial embedding? I tried the following:

```
sage: H = Graph({0:[1,3,5,4],1:[0,2,3],2:[1,4,5],3:[0,1],4:[0,2,5],5:[0,2,4]})
sage: H.set_pos({0:[213,281],1:[93,171],2:[189,35],3:[35,315],4:[315,146],5:[197,158]})
sage: H.get_embedding()
```

This gives me an `ValueError: Graph on 6 vertices has been modified and the embedding is no longer valid`

. What I expect to get is a list like the one I used to define `H`

, but with the neighbors ordered clockwise.