Он уже вышёл.

The form вышёл doesn’t exist. The second syllable is unstressed, making it вышел. This verb differs from the past tense of other prefixed forms of идти, which do have a шёл form, such as пошёл, ушёл, etc.

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Indeed, it’s fixed on tatoeba so it’s Clozemaster that’s out of date.

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