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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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Well it's still better than my original solution :) https://www.codewars.com/kata/reviews/5d72115c19aecb0001acf483/groups/5dcdc950bb304f00012488ae
In the Reason translation [1, 2, 3] --> [2, 4, 6] should be [|1, 2, 3|] --> [|2, 4, 6|] in the description since the task is talking about arays, not lists.
Reason translation could use [|1, 2, 3, 4, 5, 6, 7, 8, 9, 10|] instead of [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] in description. First is an array, second is actually a list (that's not expected by tests).
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houses should not be given from tests