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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.
No, none of mine is more efficient. Just trying new things. :-D
No, SHA1 cannot be reversed. This solutions tries several attempts to recover (using brute force) the word from SHA1.