\input chbars

\hsize=2in \vsize=3in
\tolerance=10000 \hbadness=10000
\def\nl{\unskip \hfill \break}
\def\np{%
   \ifhmode  \vadjust  \fi
   {%
      \vfill \eject
      }%
   }

\tracingall \tracingonline=0
\tracingparagraphs=0

Zeile 1

\beginchange

Zeile 2

\mark{Mark 1}%
\write 16{Ausgabe 1}%

Zeile 3

\endchange

Zeile 4

\mark{Mark 2}%

\mark{Mark 3}%

\beginchange

Zeile 5

\write 16{Ausgabe 2}%

Zeile 6

\endchange

Zeile 7


\beginchange

Zeile 8

\write 16{Ausgabe 3}%

Zeile 9

\endchange

Zeile 10

\beginchange

Zeile 11

\write 16{Ausgabe 4}%

Zeile 12

\endchange

\bye