tributes unchanged.
-->
    <math>
      <mstyle displaystyle="true">
        <munder>
          <munder><mo>O</mo><mo>O</mo></munder>
          <msub><mo>O</mo><mo>O</mo></msub>
        </munder>
        <mover>
          <munder><mo>O</mo><mo>O</mo></munder>
          <msub><mo>O</mo><mo>O</mo></msub>
        </mover>
        <munderover>
          <munder><mo>O</mo><mo>O</mo></munder>
          <msub><mo>O</mo><mo>O</mo></msub>
          <msub><mo>O</mo><mo>O</mo></msub>
        </munderover>
      </mst