1 | initial version |

You can define an iterated extension using a list:

```
K.<a,b,c> = NumberField([x^2 + 2, x^3 + 3, x^3 + 2])
```

Note that the last polynomial is used for the first extension, and so on.

Then you can get the list of embeddings and choose one using for instance

```
embs = K.embeddings(ComplexField(59)); embs
my_emb = embs[0]
my_emb(a**3+b+c)
```

But the following does not work so far:

```
K.<a,b,c> = NumberField([x^2 + 2, x^3 - 3, x^3 - 2], embedding=[sqrt(2)*CDF(I),3**(1/3),2**(1/3)])
```

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