// 测试用例（可直接运行验证）
The Endowment is a very promising project. I am happy to join and pretty excited to
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set: hookedSet,
The report pointed out how birth rates in the U.S. have been below the minimum replacement rate since 2008, meaning that the bulk of population growth since then has been the result of immigration. This has proved especially true for the country’s labor force. Nearly 80% of immigrants are of working age, according to the Census, and they account for 19% of the workforce, around 33 million people.