CodingBat encoder

encoder

Write a function that replaces the words in `raw` with the words in `code_words` such that the first occurrence of each word in `raw` is assigned the first unassigned word in `code_words`.

encoder(["a"], ["1", "2", "3", "4"]) → ["1"]
encoder(["a", "b"], ["1", "2", "3", "4"]) → ["1", "2"]
encoder(["a", "b", "a"], ["1", "2", "3", "4"]) → ["1", "2", "1"]

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Difficulty: 300

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