span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="c1"># supported operations: &quot;origin&quot;, &quot;difference&quot;, &quot;dot_multiply&quot;</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">operations</span> <span class="o">=</span> <span class="p">[</span><span class="s2">&quot;origin&quot;</span><span class="p">,</span> <span class="s2">&quot;difference&quot;</span><span class="p">,</span> <span class="s2">&quot;