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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.
You should also precise that the arguments of the
move
method are offsets.I've added some test cases for the
Camera
object too, as suggested. It is, as you say, specified in the problem, so worth doing.