List the numbers in the set that are natural numbers. 
Definitions:
Population Control
Population Control encompasses measures or policies intended to manage the growth or size of a human population.
China
A country in East Asia, the world's most populous nation, known for its rich history and significant economic and political influence globally.
Compulsory Measures
Mandatory actions or regulations enforced by an authority, often to ensure safety, compliance, or order, from which there is no option of opting out.
Economic Incentives
Financial motivations or rewards designed to influence the behavior of individuals, businesses, and governments toward desired outcomes.
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