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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.
It's not an issue, and it's been explained several times, read again the instructions, the strings must be consecutive, you're skipping "3452".
This issue appers to be solved by the codewars team, as it is not reproducible anymore. So I'm marking this as resolved.
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