I know how to run your code.
Its right there in the code
It doesn't follow the specification: you haven't implemented a static method.
I didn't implement a static method because its just extra indirection -- the spec contains enough indirection on its own, it doesn't benefit from extra confusion
Speaking of which, you say it should return
[ 'Dog', 'Wolf' ]
That is kind of a surprise compared to your original sample data and sample ooutput ... as it stands my "solution" isn't there yet
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