  <div id="setCalc">
                            <div class="button-1-s setItem" title="A set">A</div>
                            <div class="button-1-s setItem" title="B set">B</div>
                            <div class="button-1-s setItem" title="C set">C</div>
                            <div class="button-1-s setItem" title="empty set">&empty;</div>
                            <div class="button-1-s setItem" title="universal set">U</div>
                            </br>
                            <