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The phrase "a system that existed" is correct and usable in written English.
You can use it when referring to a system that was in place in the past but is no longer operational or relevant.
Example: "The researchers studied a system that existed in the early 20th century to understand its impact on modern technology."
Alternatives: "a system that was in place" or "a system that was operational".
Exact(3)
It's a system that existed informally in hospitals around the country before 1980.
What [the film is] asking for is to go back to a system that existed before.
"This bill addressed a structural problem in a system that existed for many years," Mead said in a statement.
Similar(57)
The waste heat would be converted to cold water with absorption chillers, which is a system that exists commercially.
One point that the law does not settle is how individuals can supply energy to the grid, a system that exists in other countries.
Our failure to give any value to the last phase of life, our insistence on health and safety above all, has led to a dependence on care homes that are little more than parking places; Gawande is rightly scathing about a system that exists largely as a form of containment, where the temptation is to deal with people as if they are inconvenient.
But he wondered whether a life spent in the U.N., a system that exists in the name of principle yet survives by compromise, might not be especially cooling, and he said of Annan, "Remember that he spent from 1962 — forty years — in the machine, and he has been a consummate user of the machine as well as being part of it".
There is a system that exists to help invalidate those issues, and it's far from perfect.
"It turns out," says Narula, "that anyone who wants to ask a 'What if' question about a system that exists in the real world needs to run these kind of simulations".
It is, therefore, entirely within the scope of the Commerce Clause to enact legislation that addresses the significant and harmful impact of "free riders" on a system that exists to further a broader, common goal that benefits all Americans.
"What remains is the status quo: years and years of appeals and billions of dollars to prop up a system that exists in name only," said Ana Zamora, criminal justice policy director for the ACLU of Northern California and a death penalty opponent.
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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