66.5. Notwithstanding the second paragraph of section 37, a pension granted under paragraph 7 of section 32 is reduced for its duration by 0.25% per month, computed for each month comprised between the date on which the pension is granted to the teacher and the first date on which the pension would otherwise have been granted to him without actuarial reduction under the first paragraph of that section or under the first paragraph of section 66.4.