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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.
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You're not misunderstanding. The description is wrong.
"Any set/del after an undo should disallow new undos"
Should actually be:
"Any set/del after an undo should disallow new redos"
In other words, after a set or del there is nothing to redo.
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