span class="nb">lbound</span><span class="p">(</span><span class="n">x</span><span class="p">,</span><span class="mi">2</span><span class="p">)</span><span class="w"></span>
<span class="w">    </span><span class="n">l3</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">lbound</span><span class="p">(</span><span class="n">x</span><span class="p">,</span><span class="mi">3</span><span class="p">)</span><span class="w"></span>
<span class="w">    </span><span class=