span class="kt">logical </span><span class="n">nota</span><span class="p">,</span><span class="n">notb</span><span class="w"></span>
<span class="c">!     ..</span>
<span class="c">!     .. Parameters ..</span>
<span class="w">      </span><span class="kt">double precision </span><span class="n">one</span><span class="p">,</span><span class="n">zero</span><span class="w"></span>
<span class="w">      </span><span class="k">parameter</span><span class="w"> </span><span class="p">(</span><span class="n">one</