35.5. Notwithstanding the second paragraph of section 23, a pension granted under subparagraph 6 of the first paragraph of section 19 and increased in accordance with section 20 is reduced for its duration by 0.25% per month, computed for each month comprised between the earlier of the date on which the pension is granted 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 35.4.