removed prs / prs_fn (broken, because it did not include \n in its semantics, forcing writeln to add one uncoditionally); replaced prs_fn by writeln fn;
removed prs / prs_fn (broken, because it did not include \n in its
semantics, forcing writeln to add one uncoditionally);
replaced prs_fn by writeln fn;

MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle