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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.
Which language?
Really, I would be spending so much time (in doubting myself) if it was not Firefox's Scratchpad.
It returns a substring of length "size" that starts at index 0 of the string in the brackets.
See the second case in the Ruby String object documentation.