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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.
There's no issue, the instructions are worded oddly. Make sure you're representing the population with the correct data type
If you're getting 100 test cases passed | 1 failed, re-read the population requirements and make sure you're using the correct data type