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The phrase "are of two types" is grammatically correct and commonly used in written English.
It is typically used to indicate that there are two distinct categories or classifications of something. Here is an example sentence: "The classification of animals can be divided into two main categories: vertebrates and invertebrates. Vertebrates are animals with a backbone, while invertebrates are of two types: those with exoskeletons and those without."
Exact(59)
Contact-process plants are of two types.
Reptilian intromittent organs are of two types.
Arkosic sandstones are of two types.
These considerations are of two types: industrial and political.
Ringers are of two types, mechanical or electronic.
Solar ponds are of two types: non-convecting and convecting.
Thermoreceptors are of two types, warmth and cold.
The errors are of two types.
The preconditioners are of two types.
The sex organs of ferns are of two types.
Similar(1)
Methods to monitor the atmosphere are of two types in situ measurements and remote sensing observations.
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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