Have an upvote, Maulik! I think it's important on ELL that we should keep reminding questioners about the different standards normally considered applicable to speech as opposed to writing. Particularly, formal writing, which OP specifically mentioned here. Your newly-added final example is also good, because it shows how the repetitive format (including that all-important comma) can reasonably be used in (relatively) formal writing. — FumbleFingers 11 hours ago
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