an class="fl">1</span> <span class="op">*</span> <span class="op">(</span><span class="va">ex_array</span><span class="op">[</span>,<span class="fl">1</span><span class="op">]</span> <span class="op">&lt;</span> <span class="fl">0</span> <span class="op">&amp;</span> <span class="va">ex_array</span><span class="op">[</span>,<span class="fl">2</span><span class="op">]</span> <span class="op">&lt;</span> <span class="fl">0</span><span class="op">)</span> <span class="op">+</span>
                      <span c