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The following is from a reader's response to a book review. What does I.p. mean?

The reviewer is pretty much right on target and helpful in his review; he nicely qualifies the benefits of the large book. I.p., his observation of knots repetition is correct--he is not citing "variations".

I find no listing in OED.

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This site lists "In particular" as a possibility, that seems to fit as @Harshit suggests – James Webster Sep 27 '13 at 14:21
up vote 3 down vote accepted

I think it means 'in particular'. That is a just a guess.

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