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Tuberculin skin testing
Spend
To use money to pay for goods or services, or more broadly, to use resources or time for a particular purpose.
Reciprocity Norm
A social norm dictating that people should repay, in kind, what another person has provided or done for them, fostering mutual cooperation and social bonds.
Free Gift
An item or service given without charge to a customer as an incentive or as part of a promotional strategy.
Christmas Ornament
Decorative items, often intricate and festive, used to adorn Christmas trees during the holiday season.
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