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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 agree, my first thought was to include non-english characters.
I like this solution. However the alphabet count > 1. So Character::isAlphabetic is not reliable way to filter distinct alphabet characters. Let say sentence has one or more letters from Greece of French. This solution gives wrong result in such case.