t pseudorandom C4.
        </li>
        <li>
          <b>C4_ZERO</b> returns the value of 0 as a C4.
        </li>
        <li>
          <b>C4MAT_IDENTITY</b> sets a C4MAT to the identity.
        </li>
        <li>
          <b>C4MAT_INDICATOR</b> returns the C4MAT indicator matrix.
        </li>
        <li>
          <b>C4MAT_NINT</b> rounds the entries of a C4MAT.
        </li>
        <li>
          <b>C4MAT_PRINT</b> prints a C4MAT.
        </li>
        <li>
          <b>C4MAT_PRINT_SOME</b> print