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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.
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tricky, but very stimulating, should remember to join the tables
this Kata made me a lot of trouble, but this article on Full Text Search helped a lot:
http://rachbelaid.com/postgres-full-text-search-is-good-enough/
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great for begginners, clear description, something to start with.