> <span class="special">=</span> <span class="identifier">a</span> <span class="special">*</span> <span class="identifier">a</span><span class="special">;</span>
      <span class="identifier">T</span> <span class="identifier">b2</span> <span class="special">=</span> <span class="identifier">b</span> <span class="special">*</span> <span class="identifier">b</span><span class="special">;</span>
      <span class="identifier">T</span> <span class="identifier">k</span> <span class="special">=</span> <span clas