Is it possible to put alternatives inside repeats?

[list_lilypond]

Hi, 

what I want is something like:

\repeat volta 2 {
  \alternative{
    { a | }
    { b | }
  }
  c | d | e | f | g |
  \alternative{
    { b | }
    { c | }
  d | e | f | g |  
}
\alternative{
  { b }
  { c }
}

So inside the repeat there are alternatives.

As normally the \alternative{} syntax is put outside the \repeat{}, I
really wonder whether this is possible at all.
If possible in some other way, could someone please be so kind to point
out how to repeat with embedded alternatives without rewriting all?

Thanks