pan class="nf">make_equiv</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span><span class="n">other</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot;</span>
<span class="sd">    Register equivalence of two Directional objects. </span>

<span class="sd">    Args:</span>
<span class="sd">      other: (Directional)</span>

<span class="sd">    Returns:</span>
<span class="sd">      None</span>

<span class="sd">    See also:</span>
<span class="sd">      is_e