"w"> </span><span class="p">,</span><span class="w"> </span><span class="n">n</span><span class="w"> </span><span class="p">,</span><span class="w"> </span><span class="n">nm1</span>

<span class="c">!     CHECK THE INPUT ARGUMENTS FOR ERRORS</span>
<span class="w">      </span><span class="n">an</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">n</span>
<span class="w">      </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span cla