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<p>I frequently proofed my son’s more important papers in high school, usually with an eye toward suggesting where more supporting detail was needed (he’s a superb writer, but overly concise). On the other hand, his command of grammar and punctuation is exceptional, and I frequently had him proof my business writing before submitting it – it can be very hard to catch your own written mistakes unless you set your work aside for a day or two.</p>