THE ASSOCIATION'S STATUS. The Board hereby recognizes the Association as the exclusive and sole representative, so long as said Association represents the majority of custodians, maintenance employees and maintenance helpers employed by the Board for purposes of collective negotiations concerning the terms and conditions of employment of the Employees in the bargaining unit, including light duty and heavy duty custodians, maintenance employees and maintenance helpers employed by the Board in the Paramus School System, but excluding supervisors as that term is defined in N.J.S.A. .bp1 34:13A-5.3 and all other employees. Unless otherwise indicated, the terms "light duty and heavy duty custodian, maintenance employees and maintenance helpers," as used in this Agreement, shall refer to one (1) or more of the employees represented by the Association in the negotiating unit as above defined. The term "custodian", as used in this agreement, shall refer to the classifications of "light duty" and "heavy duty" custodians employed on either a 10-month or a 12-month calendar. Where the context so requires, reference to the masculine gender shall include the feminine and reference to the singular number shall include the plural.