* Create a `testLearn` method that ensures a `Student`'s `totalStudyTime` instance variable is incremented by the specified `numberOfHours` by invoking the `.learn` method.
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-# Part 4.0 - Create `Teacher` Interface
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+# Part 4.0 - Create `Teacher` Interface
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* Create a `Teacher` interface.
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* `Teacher` should declare a `teach` method signature: