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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.
Please don't do that, we are not in 1970's C code. Variables should be declared as local as possible. You are not saving up anything and the compiler will optimize it for you anyways.