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Discover LudwigSuggestions(5)
"that I know of" is correct and usable in written English
You can use it to refer to an incomplete list of people, places, things, or ideas. For example, "I haven't been to any other countries in Europe that I know of."
Exact(58)
Not that I know of," he said.
Around 10 that I know of.
"I mean, not that I know of.
"Not that I know of," said Capt.
"Not that I know of," I replied.
Nowhere that I know of.
"Not that I know of," Vivas said.
LVG: Not that I know of.
"Not that I know of," she said.
"Nothing that I know of," I said.
"Not that I know of," Casserly said.
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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