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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 not an issue moreso redundancy in the Kata description. It is possible to divide the board into rows, columns, and subsquares and check that they all have each digit from 1-9 while ignoring any other ints. Not a broken Kata but probably overrated in difficulty.