Letters to the Editor
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Questions for Slackie
or anyone who can answer them.
I've just started to teach English and get into proofreading/copyediting, and I'm always coming across things that mystify me. I'm genuinely looking for some clarification, so please don't think I'm being snarky or smug.
Slackie wrote: "It's the difference between a cleanly, clearly communicated idea, and noise."
Is that last comma, between "idea" and "and," technically allowed to be there? Under what justification?
And: "Editing's an invisible art, and, sadly, appears to be going by the wayside..."
Since that's a compound predicate (IS an invisible art and APPEARS to be going...) and not a compound sentence, why is there a comma before the conjunction?
Thanks so much for your help.

