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Discover LudwigSuggestions(5)
"therein lay" is correct and usable in written English.
It is an idiom which means "in that lies" or "in that lies the problem/answer". For example, "The solution to the problem therein lay with him".
Exact(60)
Therein lay its originality.
Therein lay another test.
Therein lay her fabulousness.
Therein lay my quandary.
Therein lay the warning.
And therein lay the risk.
And therein lay the suspicious stench.
But therein lay their weaknesses also.
Therein lay the intrigue of this cruise.
Therein lay the manager's real frustration.
But therein lay a festering dispute.
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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