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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.
Most readable solution imho. Nice
Thank you very much @anmatika it unblocked me :) I feel silly I did not think about this at all... imo, it should have been specified in the instructions though: in the IT world, one should not consider lowercase and uppercase similar.
In this task letters are not considered case-sensitive thus T isn't unique. T (or t) includes in all the elements of the array.
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