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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.
Slightly better readability perhaps.
Idk
;) And I prefer Strng Builder over the others whenever I need to change the string often. A single concatenation or two using string might not much difference either.