The masculine gender, when appearing in the Plan, shall include the feminine gender (and vice versa), and the singular shall include the plural, unless the Plan clearly states to the contrary.  Headings and subheadings are for the purpose of reference only and are not to be considered in the construction of the Plan.  If any provision of the Plan is determined to be for any reason invalid or unenforceable, the remaining provisions shall continue in full force and effect.