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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.
Perhaps you should state up front, "We want to know the 'ordinal position' of the vowels in a given word" rather than its "index position."
Because asking for the "index position," and not expecting the index position is just poor wording for instructions...