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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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I think the problem is still not fixed. You might want to import a definition of ≡ in the test code.
The statement did not mention how to deal with input lines of different lengths. Should we
a) Pad with trailing spaces so that they all have the same length?
or b) Pad with '\0's?
or c) Do not pad, in which case the behavior wrapping is not well-defined?
Each interpretation has its pros and cons, and there is no evidence as to which one is meant by the author. Please clarify.