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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.
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if p > n-p , you will waste a lot of time.
so, I think that, you shoule give two solutions depend on whether n-p > p or not.
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:)
should be 3, ^_^. 'a' occurs four times, 'd' occurs five times and 'g' occurs twice.