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https://velog.io/@hying/React%EC%97%90%EC%84%9C-Font-Awesome-v.6-%EB%AC%B4%EB%A3%8C-%EC%95%84%EC%9D%B4%EC%BD%98-%EC%82%AC%EC%9A%A9%EB%B0%A9%EB%B2%95
