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Discover Ludwig'these existed' is correct and usable in written English.
You can use it when you want to refer to something that has previously been mentioned or when you want to explain something that already exists. For example, "These artifacts suggest that cultures of this region had complex trading networks; these existed long before Europeans arrived."
Exact(36)
Training, equipping, deploying and supervising front-line health workers to deliver the selected high impact and low cost health interventions Building on what exists – Building on existing systems and delivery platforms worked well when these existed.
She said: "We were both amazed that these existed … [Plath] had a conflicted attitude towards her own German-Austrian identity".
Though these existed long before Apple joined the mobile market, it was the iPhone which made them mainstream and hundreds of thousands have been created since 2008.
He loved playing office; why wouldn't I? The grown-up manners I observed weren't stress or busyness (though both of these existed in abundance) but rather excitement and passion.
Neither of these existed before 1980, yet last year they dished out $54m in prize money between them.Golf is now far more popular on American television than tennis, despite the latter's explosive action (see chart).
Dad loved playing office; why wouldn't I? The grown-up manners that I was observing weren't necessarily stress or busyness (though both of these existed in abundance in our house) but rather excitement and passion.
Similar(23)
These exist.
None of these exist.
Neither of these exists in an entirely purified form.
Yes, these exist, and they are awesome.
Some of these exist in European museums today.
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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