Contribution #174

Problem: ru/5.1.8

Added 1.1.18 1.1.19 1.1.20 1.1.22 1.2.20 1.2.6 2.1.19 2.8.25 5.1.1 5.1.11 5.1.2 5.1.7 5.1.8 5.1.9 5.5.10 5.5.12 5.5.18 5.5.2 5.5.20 5.5.22

Editor: Aliaksandr Melnichenka ( @astrosander )

Time: October 12, 2023 at 11:47 AM

+238 -47 lines changed