\once \override Staff.BarLine.allow-span-bar = ##f
c2 c c c
c2 c c c
\once \override Staff.BarLine.allow-span-bar = ##f
c2 c c c
}
\once \override Staff.BarLine.allow-span-bar = ##f
c2 c c c
c2 c c c
\once \override Staff.BarLine.allow-span-bar = ##f
c2 c c c
}