rightHand = \relative c' {
  \partial 4 a4
  b4 c d

  \repeat volta 2 {
    e4 |
    f4 g a b |
  }
  \alternative {
    { c4 d e }
    { f4 g a b }
  }
  \barNumberCheck #4 \barNumberCheck #6
  c1 |
}

\layout {
  \context {
    \Score
    \override BarNumber.break-visibility = #end-of-line-invisible
    barNumberVisibility = #(every-nth-bar-number-visible 1)
  }
}

\score {
  \new Staff \unfoldRepeats \rightHand
  \layout { }
}

\score {
  \new Staff \rightHand
  \layout { }
}

\score {
  \new Staff \rightHand
  \midi { }
}

\score {
  \new Staff \unfoldRepeats \rightHand
  \midi { }
}