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I was confused by this too. Have a go at submitting any old solution, then look at the cases for test 2 where the result should be 'NO' and it should all become clear.
I too examined the test data, but got stumped by #2 in test 2 which flags as a valid function. At the end it changes from being a linear relationship into something quite different. I guess I am missing the intent of the question. e.g.