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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.
I should add in the description that accelaration is supposed to be positive.
Fixed.
Fixed
Because there is no such rule. If you refer to the central column/row, well, all of them should be a complete set, I don't see why that should be explained as separate items.