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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.
Same problem seems to appear in n=6, 14, 18, 22, 26, etc. (is there no test for n=10?)
Its quite easy to adapt the solution so it still works, but might be better to fix it if possible.
Test for n = 4 is no more.