   <span class="keyword">float</span> <span class="identifier">as</span> <span class="special">=</span> <span class="special">(</span><span class="identifier">a</span><span class="special">[</span><span class="identifier">idx</span><span class="special">]</span> <span class="special">+</span> <span class="identifier">a</span><span class="special">[</span><span class="identifier">idx1</span><span class="special">]</span> <span class="special">+</span> <span class="identifier">a</span><span class="special">[<