r><td>
                        Quad strip
                        </td><td class="center">
                        <math overflow="scroll">

                            <mrow>
                                <mn>2</mn>
                                <mo>⁢</mo>
                                <mi mathvariant="italic">i</mi>
                                <mo>+</mo>
                                <mn>2</mn>
                            </mrow>
                        </math>
                        </td><