ass="o">--</span><span class="o">+</span><span class="w">
                                    </span><span class="p">|</span><span class="w">                      </span><span class="p">|</span><span class="w">
                                    </span><span class="ss">v</span><span class="w">                      </span><span class="ss">v</span><span class="w">
                          </span><span class="o">+</span><span class="o">--</span><span class="o">--</span><span class="o">--</span><span class="o