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Term 1: Term 2:

(subclass MechanicalProcess NaturalProcess) engineering.kif 635-635 Mechanical process is a subclass of natural process
(subclass Friction MechanicalProcess) engineering.kif 643-643 Friction is a subclass of mechanical process
(subclass MechanicalResonance MechanicalProcess) engineering.kif 652-652 Mechanical resonance is a subclass of mechanical process

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