raction:    <span class="accent" data-operation="subtraction"></span>
            </li>
            <li>
                Multiplication:    <span class="accent" data-operation="multiplication"></span>
            </li>
            <li>
                Division:    <span class="accent" data-operation="division"></span>
            </li>
            <li>
                Remainder:    <span class="accent" data-operation="remainder"></span>
            </li>
            <li>
                Exponentiation:    <