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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 kata's description is ridiculously badly written. It is so frustrating to write the whole solution just to find out at the end that there is supposed to be a rollback functionality. The self capture move is not explained, some edge cases are not explained, important information does not get highlighted enough (letter I does not count etc.). This kata would be pretty fun to complete if not for this terrible explanation...