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Discover LudwigThe correct phrase is "back then".
You can use the phrase "back then" to refer to a period of time in the past or to indicate a comparison between two periods of time. For example: "Back then, cell phones weren't as popular as they are today."
Exact(60)
No farther back than 1878, when P.F.
He's a better back than I thought.
"It goes further back than that.
Certain aerobic activities are safer for your back than others.
It's easy to look further back than the 1970s.
"I've come back from way farther back than this.
But their relationship goes further back than that.
The new service's roots go further back than that, however.
Standing is better for the back than sitting.
"We figured out we are further back than we thought.
The deadlock extends further back than last year.
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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