{{alias}}()
    Returns a list of operation sides.

    The output array contains the following operation sides:

    - left: a triangular matrix is on the left side of a matrix-matrix
      operation. For example, AX = B, where A is a triangular matrix.
    - right: a triangular matrix is on the right side of a matrix-matrix
      operation. For example, XA = B, where A is a triangular matrix.

    Returns
    -------
    out: Array<string>
        List of operation sides.

    Examples
    --------
    > var out = {{alias}}()
    [ 'left', 'right' ]

    See Also
    --------