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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.
Lack of support for C# 12 is a general problem for the whole Codewars, and not an issue specific to this kata. Closing as not a kata issue. The support for C# 12 has already been requested.