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Discover LudwigSuggestions(1)
The phrase "a second letter" is correct and usable in written English.
You can use it when referring to an additional letter in a sequence or as part of a series of letters.
Example: "After reviewing the first letter, I decided to send a second letter to clarify my points."
Alternatives: "another letter" or "a follow-up letter".
Exact(59)
We then sent a second letter of invitation for the resident who had not rejected this program.
He wrote a second letter.
A second letter to Mr. Levin from Brig.
"But a second letter arrived in the autumn.
A second letter discurssed a show under preparation.
A second letter from Smith arrived a week later.
A second letter, in 1934, contained an equally odd proposition.
"What is his name?" Within days, a second letter arrives.
Soon, a second letter arrived, Stan's life told in vignettes.
A second letter was sent to the minister in August.
Similar(1)
A second letter is mailed to workers who cannot be contacted after 10 days of attempts.
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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