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Discover LudwigSuggestions(5)
The phrase "are two classes of" is correct and usable in written English.
It can be used when categorizing or classifying items, concepts, or phenomena into two distinct groups.
Example: "In the study of animals, there are two classes of vertebrates: mammals and reptiles."
Alternatives: "there exist two categories of" or "there are two types of".
Exact(60)
There are two classes of Saudi princes.
There are two classes of seating, as Dr. Klass noted.
No democratic chamber where there are two classes of members is likely to endure.
There are two classes of NEAs that deeply cross Earth's orbit on an almost continuous basis.
But when you drill down and follow the money trail, there are two classes of investors caught in this scam.
There are two classes of these.
There are two classes of priorities: static and dynamic.
Depression and anxiety are two classes of psychiatric disease.
Those are two classes of people who like to eat well and get their money's worth".
There are two classes of problems one is embarrassingly parallel, and then there is everything else.
There are two classes of gamers: those who like online multiplayer and those who like to play alone.
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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