Factor the expression completely. 
Definitions:
Unpleasant Stimulus
A negative or disagreeable input or event that affects an individual's mental or physical state.
Pleasant Stimulus
A stimulus that is enjoyable or pleasing to the senses.
Variable-interval Schedule
A reinforcement schedule where a response is rewarded after an unpredictable amount of time has passed.
Electronic Mail
A method of exchanging messages digitally between people using electronic devices.
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