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A method claim dependent on an apparatus claim? (US7873522)

Regarding patent US7873522 (Measurement of spoken language training, learning and testing): I would like to know why dependent claim 18 begins "The method of claim 17..." when claim 17 is not a ...
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Is it an apparatus or a system?

Imagine that I have a device that gets inserted into a car engine to speed up the car. It consists of 3 parts that are connected via tubes. Is it an apparatus that gets inserted into a system (the car ...