Contribution #510

Problem: ru/5.2.12

Added 5.2.1-5.2.2 5.2.10 5.2.12 5.2.13 5.2.15 5.2.17

Editor: Aliaksandr Melnichenka ( @astrosander )

Time: November 7, 2023 at 02:54 PM

GitHub commit: dd1594de127cf73324ab5e283983dfa6659616a2

+242 -50 lines changed