Contribution #1358

Problem: ru/6.6.20

Added 6.6.20

Editor: Aliaksandr Melnichenka ( @astrosander )

Time: April 8, 2024 at 06:22 AM

GitHub commit: 7c0f032d3b07fcf52ddc2e98a76f6ed1df630bfa

+210 -165 lines changed