Contribution #630

Problem: ru/8.4.1

Added 8.4.1 8.4.12

Editor: Aliaksandr Melnichenka ( @astrosander )

Time: November 17, 2023 at 07:32 PM

GitHub commit: 4e639508f7319496fecfff1e8fdc06206763da05

+245 -48 lines changed