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Discover LudwigThe phrase "about four sets" is correct and usable in written English.
It can be used when estimating or approximating a quantity, specifically referring to sets of items or groups.
Example: "For the project, we will need about four sets of data to analyze the results effectively."
Alternatives: "approximately four sets" or "roughly four sets".
Exact(2)
The pair are considering topics for their next film while they schedule the release of To the Edge of the Sky, the latest documentary they produced and directed, about four sets of parents fighting for FDA approval of potentially lifesaving drugs for their children.
I'd say about four sets of tires.
Similar(58)
"The Grand Slams are about five sets," Hewitt said.
"New Jerseyans are sensitive about overdevelopment, and about two sets of rules," Mr. Rebovich said.
Friday's filing provides additional details about two sets of trades made by SAC in 2008.
13.30 Domestic crisis continues with spate of emails about two sets of the wrong keys 3,000 miles away.
(The current largest, built by the Department of Homeland Security's U.S.-VISIT program, holds a hundred and twenty-six million biometric identities; the F.B.I.'s database holds about seventy million sets of fingerprints).
Dan emphasises that the songs aren't about his own relationship but about two sets of friends who have recently divorced.
However, there is something appealing about having just one computer and not having to worry about two sets of data and applications.
It was a strikingly original reinvention of the Hatfields-versus-McCoys tale, about two sets of warring brothers who share the same father.
Also, among my gifts were 16 silver sauce spoons and about five sets of Laguiole steak knives; maybe he meant to encourage me.
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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