pan class="c">!</span>
<span class="w">      </span><span class="n">nota</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">lsame</span><span class="p">(</span><span class="n">transa</span><span class="p">,</span><span class="s1">&#39;N&#39;</span><span class="p">)</span><span class="w"></span>
<span class="w">      </span><span class="n">notb</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">lsame</span><span class="p">(