YOU SAID:

Failure is always an option

INTO JAPANESE

失敗は常にオプション

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Failure is always optional

INTO JAPANESE

失敗は常に省略

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Failure doesn't always

INTO JAPANESE

失敗しない常に

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Fails and not always

INTO JAPANESE

失敗しては限らない

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Not necessarily fail

INTO JAPANESE

必ずしも失敗

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Not necessarily fail