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The phrase "by a pair" is correct and is used in both spoken and written English.
You can use "by a pair" when talking about two things that have been grouped together, usually in the context of a purchase or acquisition. For example: "We bought a few new bookshelves for the library, by a pair."
Exact(60)
Seconds later we're spotted by a pair of Australian tourists.
His eyes were hidden by a pair of dark sunglasses.
It is represented by a set of twins (or in Egyptian astrology by a pair of goats and in Arabian astrology by a pair of peacocks).
The plot next to Kilvert, intended for her, was taken by a pair of spinster sisters.
One was Good Charlotte, led by a pair of identical twins, Benji and Joel Madden.
The day was bookended by a pair of dogged Hampshire partnerships.
"I was struck by a pair of dark eyes, a flash of innocence, an unusual demeanour.
The report was inspired by a pair of speeches in June 2014.
We had a couple of beers before being joined by a pair of innocuous-looking girls.
The walls are crammed with duff paintings – dominated by a pair of queasy, pastel clowns.
Heritage Auctions was founded in Dallas, in 1976, by a pair of rare-coin dealers.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com