rge;">Press C for clearing all the points you added.</li>
                                <li style="list-style-type:square;text-align: left;margin-left: 5.5em; font-size: large;">Press U to undo the last point you added.</li>
                                <li style="list-style-type:square;text-align: left;margin-left: 5.5em; font-size: large;">Press R to switch to the Gaussian kernel.</li>
                                <li style="list-style-type:square;text-align: left;margin-left: 5.5em; font-size: la