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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.
The instructions say 'Each account number should have 9 digits, all of which should be in the range 0-9.' But the tests have account numbers that are not 9 digits long.
one of your test cases for 'odd' has an even amount of numbers in the array.