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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.
Ok, I see comments below. I think this is bug in kata, but this is only my opinion.
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Random test - Java:
Random 1: arrays first differed at element [8]; expected:<-190118661> but was:<1420494075>
Minimum with fold function, to learn it
Using recursion, why not :D