Regulations

in the case of a defined benefit plan which provides for unreduced benefits commencing before the social security retirement age (as defined in section 415(b)(8)), rules providing for the reduction of the maximum excess allowance and the maximum offset allowance, and

in the case of an employee covered by 2 or more plans of the employer which fail to meet the requirements of subsection (a)(4) (without regard to this subsection), rules preventing the multiple use of the disparity permitted under this subsection with respect to any employee.

For purposes of clause (i), unreduced benefits shall not include benefits for disability (within the meaning of section 223(d) of the Social Security Act).