I have the following frame:

```
df <- structure(list(returns = list(c(1,2,3,4,5,6), c(7,8,9,10,11,12)), indexId = c("a", "b")), class = "data.frame", row.names = 1:2)

```

Is there an easy way to convert this into a normal `data.frame` so it appears as:

```
Choice ppl
   1   a
   2   a
   3   a
   4   a
   5   a
   6   a
   7   b
   8   b
   9   b
  10   b
  11   b
  12   b

```

I have a solution using `For` but I am looking for something simpler.

All help is much appreciated!