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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.
i absolutly agree with you , in fact they should accept all forms of data types for a more realistic and complete training ...
range('a', 'z') is ok. Have a look at array_search()