n><span class="op">)</span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co"># Define class B</span></span></span>
<span class="r-in"><span><span class="va">B</span> <span class="op">&lt;-</span> <span class="fu"><a href="new_class.html">new_class</a></span><span class="op">(</span><span class="va">E</span>, <span class="va">D</span>, class_name <span class="op">=</span> <span class="st">"B"</span><span class="op">)</span></span></span>
<span class="r-in"><span