"p">:</span>
        <span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="sa">f</span><span class="s2">&quot;size should be less than the number of unique pairs </span><span class="si">{</span><span class="nb">len</span><span class="p">(</span><span class="n">t</span><span class="p">)</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="n">t</span><s