 <li>
          <b>PERM_CHECK2</b> checks that a vector represents a permutation.
        </li>
        <li>
          <b>PERM_INVERSE</b> inverts a permutation "in place".
        </li>
        <li>
          <b>PWL_INTERP_2D_SCATTERED_VALUE</b> evaluates a 2d interpolant of scattered data
        </li>
        <li>
          <b>R8TRIS2</b> constructs a Delaunay triangulation of 2D vertices.
        </li>
        <li>
          <b>SWAPEC</b> swaps diagonal edges until all triangles are Delaunay.
        </