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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.
The error is with the first step.
0cannot swap places with6; diagonal movement does not work.EDIT: looks like you're entering the position of the number rather than the actual number. The solution in your example should be
[5, 6, 8, 2, 4, 1, 2, 5, 6].It's in beta now :)