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Define addition rule.
Serotonin
A neurotransmitter that plays an important role in mood regulation, as well as sleep, appetite, and digestion.
Depression
A psychiatric condition defined by a sustained low mood or apathy towards activities, significantly hindering daily operations.
Oversupply
A situation in which the quantity of a product or service exceeds the demand for it, often leading to lower prices and surplus.
Undersupply
A situation where the availability of a commodity or service is insufficient for the demand.
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