rse of a C4.
        </li>
        <li>
          <b>C4_LE_L1</b> := X <= Y for C4 values, and the L1 norm.
        </li>
        <li>
          <b>C4_LE_L2</b> := X <= Y for complex values, and the L2 norm.
        </li>
        <li>
          <b>C4_LE_LI</b> := X <= Y for C4 values, and the L Infinity norm.
        </li>
        <li>
          <b>C4_LOG</b> evaluates the logarithm of a C4.
        </li>
        <li>
          <b>C4_MAG</b> returns the magnitude of a C4.
        </li>
        <li>
        