<span class="p">[</span><span class="s2">&quot;tx&quot;</span><span class="p">,</span> <span class="s2">&quot;nc&quot;</span><span class="p">],</span> <span class="p">[(</span><span class="s2">&quot;tx&quot;</span><span class="p">,</span> <span class="s2">&quot;belongs&quot;</span><span class="p">,</span> <span class="s2">&quot;nc&quot;</span><span class="p">),</span> <span class="p">(</span><span class="s2">&quot;tx&quot;</span><span class="p">,</span> <span class="s2">&quot;neighbors&quot;</span><span cla