\version "2.16.0"
\header { tagline = ##f}
\layout{ \context { \Voice \consists "Ambitus_engraver"  }}
\score {
  \new ChoirStaff <<
    \new Staff {\new Voice = one   {\relative f'' { \key f \major f eis f, eis \bar "|." }}}
    \new Staff {\new Voice = two   {\relative f'' { \key f \major f eis eis, f \bar "|." }}}
    \new Staff {\new Voice = three {\relative f'' { \key f \major eis f f, eis\bar "|." }}}
    \new Staff {\new Voice = four  {\relative f'' { \key f \major eis f eis, f\bar "|." }}}
  >>
}