\layout {
  \context {
    \Voice
    % Permit automatic line breaks within tuplets.
    \remove "Forbid_line_break_engraver"
    % Allow beams to be broken at line breaks.
    \override Beam.breakable = ##t
  }
}

\relative c'' {
  <>^"manually forced line break"
  a8
  \repeat unfold 5 { \tuplet 3/2 { c8[ b g16 a] } }
  \tuplet 3/2 { c8[ b \break g16 a] }
  \repeat unfold 5 { \tuplet 3/2 { c8[ b g16 a] } }
  c8 \bar "||"
}

\relative c'' {
  <>^"automatic line break"
  \repeat unfold 28 a16
  \tuplet 11/8 { a16[ b c d e f e d c b a] }
  \repeat unfold 28 a16 \bar "||"
}

\paper { tagline = ##f }