\header {
  texidoc = "The feta font has arrow heads"
}

\lyrics {
  \markup {

    \arrow-head #X #RIGHT ##t
    " "
    \arrow-head #X #LEFT  ##t
    " "
    \arrow-head #Y #RIGHT ##t
    " "
    \arrow-head #Y #LEFT  ##t
    " "

    
    \arrow-head #X #RIGHT ##f
    " "
    \arrow-head #X #LEFT  ##f
    " "
    \arrow-head #Y #RIGHT ##f
    " "
    \arrow-head #Y #LEFT  ##f
  }
}

\version "2.16.0"