represented by a labor organization pursuant to subsection (b) may be reviewed, rescinded, amended, altered, or varied, other than— (1) to include in the unit any employees who are not represented by a labor organization, or (2) to merge bargaining units that are represented by the same labor organization, before the first day of the last 3 months of the first collective agreement entered into after the date of transfer that applies to those employees and that has resulted from collective bargaining between such labor organization and the Corporation. (h) Deduction (1) In general Notwithstanding section 91103, section 7115 of title 5 shall not apply to this chapter. (2) Dues When a labor organization holds exclusive recognition, the Corporation shall deduct the regular and periodic dues, initiation fees, and assessments (not including fines and penalties) of the organization from the pay of all members of the organization in the unit of recognition if the Corporation (or, before the date of transfer, the Agency) has received from each employee, on whose account such deductions are made, a written assignment which shall be irrevocable for a period of not more than 1 year. (3) Continuation Any agreement described in subsection (c) that provides for deduction by the Agency of the regular and periodic dues, initiation fees, and assessments (not including fines and penalties) of the labor organization from the pay of its members shall continue in full force and effect and the obligation for such deductions shall be assumed by the Corporation. No such deduction may be made from the pay of any employee except on the employee’s written assignment, which shall be irrevocable for a period of not more than 1 year. 91106. Collective-bargaining agreements (a) In general Except as provided under section 91105(c), collective-bargaining agreements between the Corporation and bargaining representatives shall be effective for not less than 2 years. (b) Procedures Collective-bargaining agreements between the Corporation and