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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.
@Gabr13dev: in what is that related to "solutions grouping"?? => use the discrouse section of the kata you're working on to ask for help.
What do you mean by 'it does not accept'?