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Discover LudwigSuggestions(5)
"two classes of" is correct and is typically used to introduce a comparison between two distinct groups of people or things.
For example, "There are two classes of students in this school - those who excel in mathematics and those who excel in science."
Exact(60)
Two classes of polymerization usually are distinguished.
There were two classes of verb stems.
That creates two classes of member.
There are two classes of Saudi princes.
Will two classes of competition be needed?
He believes there should not be two classes of citizenship.
There should not be two classes of investors".
There are two classes of seating, as Dr. Klass noted.
Ford and Berkshire Hathaway both have two classes of shares.
Like many media companies, it has two classes of stock.
There are two classes of these.
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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