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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 didn't find this solution on SO in Python and remade it on Scala.
I understand everything in this code except the line
target += top ** 2, if someone reads this comment and understands this problem better - help me understand why this operation is performed.