The provisions of this compact shall be severable, and if any phrase, clause, sentence or provision of this compact is declared to be contrary to the Constitution of any compacting state or of the United States the validity of the remainder of this compact and the applicability thereof to any government, agency, person or circumstance shall not be affected thereby; provided, that if this compact is held to be contrary to the constitution of any compacting state the compact shall remain in full force and effect as to all other compacting states.