The precedents established by George Washington during his presidency include:
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He chose well-known leaders to run his executive departments and serve as his advisors. - Washington set the precedent of selecting a Cabinet made up of prominent figures in order to receive advice and guidance.
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He chose to not run for a third term. - By voluntarily stepping down after two terms, Washington established the tradition of a two-term limit for U.S. presidents, which was later codified in the 22nd Amendment.
The other two statements—regarding the establishment of a judicial system of nine justices and a tax and tariff cabinet position—do not correctly reflect the precedents set by Washington. The Supreme Court's structure and the tax system evolved later and were not directly established by Washington in the manner described.