an><span class="w"> </span><span class="nx">Upper</span><span class="w"> </span><span class="p">{</span>
<span class="w">  </span><span class="kr">constructor</span><span class="w"> </span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
<span class="w">    </span><span class="k">super</span><span class="p">()</span>
<span class="w">    </span><span class="k">this</span><span class="p">.</span><span class="nx">range</span><span class="w"> </span><span class="o">=</span><span class="