Statutory Changes and Savings. If any provisions of this Agreement are held to be contrary to law by the P.E.R.B. or a court of competent jurisdiction, or if there are statutory changes affecting this Agreement, then such provision shall not be deemed valid and subsisting, except to the extent permitted by law, but all other provisions shall continue in full force and effect. Should a provision or application be deemed invalid, the parties shall, upon demand of either, meet not later than thirty