@MichaelRozenberg Just out of curiosity - does AoPS forum have tags? How did you create lists of examples there?

@MartinSleziak Here it much more better! Here I have a possibility to create tags and inside this tag we have problems about the theme. I have possibility to see how use this tag other users. Also number of problems with this theme on the one page is much more bigger . There is something else, but I can not find a formulation .

Thanks for the response! As I said, I was mainly curious whether and how you did the same thing on AoPS.