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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.
How would not having a loop account for different input?
Don't allow yourself to feel inadequate at least not to the level of giving up. Keep trying. I started about 2 years ago and felt like coding was not for at times. Keep learning new things and more than all keep trying to solve coding challenges, you can start with relatively easy ones.