def _is_begin_bulk(line_upper: str) -> bool:
    """
    is this a:
      'BEGIN BULK'
    but not:
      'BEGIN BULK SUPER=2'
      'BEGIN BULK AUXMODEL=2'
      'BEGIN BULK AFPM=2'

    """
    is_begin_bulk = 'BULK' in line_upper and (
        'AUXMODEL' not in line_upper and
        'AFPM' not in line_upper and
        'SUPER' not in line_upper)
    return is_begin_bulk