="pln"><span class="n"><a id="t13" href="#t13">13</a></span><span class="t">&nbsp;</span><span class="r"></span></p>
    <p class="run"><span class="n"><a id="t14" href="#t14">14</a></span><span class="t"><span class="key">def</span> <span class="nam">test_gen_dfs_square</span><span class="op">(</span><span class="op">)</span><span class="op">:</span>&nbsp;</span><span class="r"></span></p>
    <p class="run"><span class="n"><a id="t15" href="#t15">15</a></span><span class="t">        <span class="nam">thre