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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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It was javascript, already fixed it.
Which language(s)?
Incorrect kata.
Since in the description it says "We need a function that receives two arrays arr1 and arr2, each of them, with elements that occur only once".
OCCUR ONLY ONCE!
But in the random tests there are a lot of repetitions. So be careful - you have to filter array first to leave just unique valu@es.
@raulbc777, you should change either description or tests.
Facing the same problem - seems like an issue with the kata.