Problem with repetition

[Martin Chicoine]

What is the problem with this example? The second alternative does not show.

Thanks.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\version "2.12.3"

\score {
  \new Staff {
    \new Voice {
       \relative c'' {
                  \repeat volta 2 {
                             a4 b d f |
                             c a c d |
                             c d e a |
                  }
                  \alternative {
                             {a c e d} |
                             {a d c e} |
                  }
       }
    }
  }
  \layout {}
}