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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.
My bad, this is a suggestion all right :)
The requirement of having to find 5 highest values suggest repeated use of one function. The kata can be made a bit more attractive by requiring the use of different functions, for example: highest, lowest, average, etc.
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