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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.
The the last case: 25,25,50,100, ...
Not a kata issue.
Answer is YES. This is valid as you can return the 4th with 50 and 25.