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並前往https://books.google.com.tw/books?id=I6y3DQAAQBAJ&pg=PT165&lpg=PT165&dq=str_replace+dplyr&source=bl&ots=FwYJZB0m-6&sig=ACfU3U12Rt1KwhN51OTg3CXQ5IPdLwpWMQ&hl=zh-TW&sa=X&ved=2ahUKEwje-IiQ_PP0AhWb7HMBHalKC3IQ6AF6BQiiAhAD

R for Data Science: Import, Tidy, Transform, Visualize, and ...

(mutate(key = stringr::str_replace(key, "newrel", "new_rel"))). 3. I claimed that iso2 and iso3 were redundant with country. Confirm this claim. 4.

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