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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.
My solution passed without any problem and is using lambda.
Seems that the problem was fixed.
The test suite passed, but I don't think that this solution is actually correct.
¯\_(ツ)_/¯
"Can't use Operator >" when using lambda functions (this problem is so simple that I'm trying to golf it).