Contribution #82

Problem: ru/9.1.2

Added 9.1.1 9.1.2 9.1.3 9.1.4 9.1.5

Editor: Aliaksandr Melnichenka ( @astrosander )

Time: October 10, 2023 at 10:47 PM

GitHub commit: c1f310dd86d56000cadbc8a7d73803c5a0d0ddba

+217 -46 lines changed