span class="o">=</span><span class="w"> </span><span class="n">rprev</span>
<span class="w">                  </span><span class="k">GOTO</span><span class="w"> </span><span class="mi">80</span>
<span class="w">               </span><span class="k">ENDIF</span>
<span class="k">            ENDIF</span>
<span class="k">            DO </span><span class="n">j</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">jmin</span><span class="w"> </span><span class="p">,</span>