al>& </span><span class=identifier>self</span><span class=special>)
            </span><span class=special>{
                </span><span class=identifier>first </span><span class=special>=
                </span><span class=special>(
                    </span><span class=identifier>expression  </span><span class=special>= </span><span class=identifier>term </span><span class=special>&gt;&gt; </span><span class=special>*((</span><span class=literal>'+' </span><span class=special>&gt;&gt; </span><span class