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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.
Very good suggestion.
OK, how is this best practices exactly? (Does the label even make sense in this context?)
Perhaps some more tests are needed to cover more complicated strings: http://stackoverflow.com/a/16776621/16777