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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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Hi Robin479,
Regarding your first observation you are right, there might be cases that a sentence starts with a space. As of your second observation there is no point writing code for every kind of possibility, I don't think that this is the purpose of this kata. If we wanted to deepen the problem we could write a compiler from scratch! Either way thank you for your comment.