% This is demo.ch3 @x writeln('I am line2'); writeln('I am line3'); @y writeln('I am line1 from changefile3'); @z @x writeln('I am line4'); writeln('I am line5'); writeln('I am line6'); @y writeln('I am line2 from changefile3'); writeln('I am line3 from changefile3'); @z @x writeln('I am line11'); @y writeln('I am line4 from changefile3'); @z