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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.
Checkout https://www.postgresql.org/docs/9.1/static/functions-string.html first and
try use another function.
Why do I get an error about the greatest rank? The program looks at the rank of the second record. And the first record corresponds to the expected one.
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