Contribution #579

Problem: ru/8.3.21

Added 8.3.10-8.3.14 8.3.16-8.3.21

Editor: Aliaksandr Melnichenka ( @astrosander )

Time: November 13, 2023 at 04:47 PM

GitHub commit: 8935bae12073ecb6c95a506de7804e9a820290c6

+237 -49 lines changed