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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Why Distinct first?
But you always know which line is wrong:D
need add " this" in all case, because now you create 2 string in memory
Use delegate "Where(char.IsLetter)"
Он решил задачу математически, мы алгоритмически.