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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.
Oh thanks I didnt know that
$can successfully match a final newline.The input is
"1234\n". I can;t remember exactly how it works in Java, but in some implementations,$can successfully match a final newline, resulting in wrong answers for this challenge.This comment is hidden because it contains spoiler information about the solution