rs to replace letters in OLD_SET with. </p><pre class="fragment">     If the new_set is the empty set the matched characters are deleted.

     If the new_set is shorter than the old set the last character in the
     new set is used to replace the remaining characters in the new set.
</pre> <h2><a class="anchor" id="autotoc_md72"></a>
RETURNS</h2>
<p>outstr instr with substitutions applied</p>
<h2><a class="anchor" id="autotoc_md73"></a>
EXAMPLES</h2>
<pre class="fragment">Sample Program:

 program demo_tr