div class="button-1-s setItem" title="open parentheses">(</div>
                            <div class="button-1-s setItem" title="intersection">&cap;</div>
                            <div class="button-1-s setItem" title="union">&cup;</div>
                            <div class="button-1-s setItem" title="complement">'</div>
                            <div class="button-1-s setItem" title="close parentheses">)</div>
                            <div class="form-control text-box" id="set"></div>
         