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Discover Ludwig"were once" is correct and usable in written English.
This phrase is most often used to express something that happened in the past but is no longer the case. For example: "This once bustling town was a center of commerce, but its buildings were once filled with the music of the townspeople."
Dictionary
were once
adverb
One and only one time.
Exact(60)
Americans were once more sceptical.
They were once 7-7.
Models Were once babies too.
Some were once show horses.
Some were once Irvin's players.
They were once green.
These were once homes.
Missouri, were once built.
They were once five brothers.
Old works were once new.
They were once so close.
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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