$(lst_syntax)append $emph object s1 $emphend to $emph str $emphend</span>
$lst_mean String manipulation: append object $emph s1 $emphend to the
string $emph str$emphend;$emph object$emphend may be $emph item$emphend,
$emph word$emphend,$emph line$emphend,$emph colon$emphend or $emph semicolon$emphend. The object $emph s1 $emphend should not be empty before evaluation.