     <mi mathvariant="italic">s</mi>
                                                    <mo>&gt;=</mo>
                                                    <mi mathvariant="italic">a</mi>
                                                </mrow>
                                            </mtd></mtr>
                                            <mtr><mtd>
                                                <mrow>
                                                    <mi mathvariant="italic">s</mi>
                 