\paper {
  system-separator-markup = \slashSeparator
  line-width = 120
  tagline = ##f
}

notes = \relative c' {
  c1 | c \break
  c1 | c \break
  c1 | c
}

\book {
  \score {
    \new GrandStaff <<
      \new Staff \notes 
      \new Staff \notes 
    >>
  }
}