=</span><span class="w"> </span><span class="o">&#39;</span><span class="nv">C</span><span class="o">&#39;</span><span class="w"> </span><span class="ow">or</span><span class="w"> </span><span class="o">&#39;</span><span class="nv">c</span><span class="o">&#39;</span><span class="w">   </span><span class="nv">x</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="nv">A</span><span class="o">**</span><span class="nv">H</span><span class="o">*</span><span class="nv">x</s