Assume you have a list :

```
mylist=[[1,2,3,4],[2,3,4,5],[3,4,5,6]]

```

any pythonic(2.x) way to unpack the inner lists so that new list should look like ?:

```
mylist_n=[1,2,3,4,2,3,4,5,3,4,5,6]

```