\relative c'' {
  \repeat volta 2 { c1 }
  \set Score.doubleRepeatBarType = ":..:"
  \repeat volta 2 { c1 }
  \set Score.doubleRepeatBarType = ":|.|:"
  \repeat volta 2 { c1 }
  \set Score.doubleRepeatBarType = ":|.:"
  \repeat volta 2 { c1 }
}