pan> <span class="o">&lt;</span> <span class="bp">self</span><span class="o">.</span><span class="n">lower_bound</span><span class="p">]</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">lower_bound</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">pm</span><span class="p">[</span><span class="bp">self</span><span class="o">.</span><span class="n">pm</span> <span class="o">&gt;</span> <span class="bp">self</span><span class="