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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.
Not an issue, a question, especially when it's because your algorithm is not correct ;-)
That part means
a(n)
could be not equal tob(n)^2
or thatb
is shuffled.That would be against the instructions:
Read carefully the description and try to use the hint.