"identifier">create</span><span class="special">-</span><span class="identifier">expression</span><span class="special">(</span><span class="identifier">a</span><span class="special">)</span>
<span class="identifier">expression2</span> <span class="special">=</span> <span class="identifier">create</span><span class="special">-</span><span class="identifier">expression</span><span class="special">(</span><span class="identifier">expression1</span><span class="special">,</span> <span class="identifier">op1</s