Contribution #1413

Problem: ru/1.1.20

Added 1.1.16-1.1.18,Updated 1.1.19&1.1.20

Editor: Aliaksandr Melnichenka ( @astrosander )

Time: June 14, 2024 at 08:00 PM

GitHub commit: 4944a485c95ae43ad1e5cc05bc31b14beef85a59

+138 -204 lines changed