a</span> <span class="o">+</span> <span class="n">n</span><span class="p">,</span> <span class="n">b</span> <span class="o">+</span> <span class="n">n</span><span class="p">,</span> <span class="n">b</span> <span class="o">-</span> <span class="n">c</span><span class="p">,</span> <span class="n">b</span> <span class="o">-</span> <span class="n">n</span><span class="p">,</span> <span class="n">a</span> <span class="o">-</span> <span class="n">n</span><span class="p">,</span> <span class="n">a</span> <span cl