Contribution #224

Problem: ru/6.1.12

Added 6.1.1 6.1.2 6.1.3 6.1.4 6.1.5 6.1.6 6.1.7 6.1.8 6.1.9 6.1.10 6.1.11 6.1.12 6.1.13

Editor: Aliaksandr Melnichenka ( @astrosander )

Time: October 15, 2023 at 08:49 PM

+244 -48 lines changed