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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.
In some cases Linq performance is good in some it is slower. In this case concat & case is good choise. If strings would be massive or many of them then string builder would be better choise.