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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.
this is a German supermarket, so no human factor is involved xD
Make sure you know your input, have you printed and done type checks? Also, this may help: Troubleshooting-your-solution
If you're not sure why something is happening, post instead as a
question. Anissueis reserved for when there is a provable problem with the kata.