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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 see what you're thinking Chrono79 but it doesn't say anything about indexing each word and setting relative odd/even index value. Within the string index, characters either fall on odd or even, thus 'string with all even indexed characters...' is different from 'all even characters of index of words within the string'