er execution control back to main()</span>
                <span class="identifier">source</span><span class="special">();</span>
            <span class="special">}</span>
        <span class="special">});</span>

    <span class="identifier">sink</span><span class="special">();</span>
    <span class="identifier">sink</span><span class="special">();</span>
    <span class="identifier">sink</span><span class="special">();</span>
    <span class="identifier">sink</span><span class="special">();</span>
    <