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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.
In English, it depends on the context / spelling as to whether it's a vowel. Sometimes it is, sometimes not.
From the description:
Note: for this kata "y" isn't considered a vowel.