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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.
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Bit shift gigachad
Does the use of a length 1 array in
text.Split(new[] {"\n"})
have any special benefit or purpose compared to
text.Split('\n')
?
With the .Distinct() fix, as suggested by "zombibly", this is both a clean and clever solution! Linq for the win :D