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Discover LudwigThe phrase "a second group" is correct and usable in written English.
It can be used when referring to an additional or alternative group in a discussion or analysis.
Example: "In our study, we compared the results of the first group with those of a second group to determine the effectiveness of the treatment."
Alternatives: "another group" or "a different group".
Exact(59)
A second group of 102 people had H.I.V. only.
A second group left three days later, on September 1st.
A second group of grandparents completed the course in December.
A second group, the outer hair cells, did not reappear.
A second group of biologically active substances is called prostaglandins.
Then on Friday, a second group of guerrillas released a similar message threatening Mr. Zarqawi.
The city gave a second group of schools the option to take part.
A second group was challenged with a hand dynamometer, which measures grip strength.
A second group solved word puzzles that did not refer to money.
But then a second group of policemen, positioned closer to the palace, opened fire.
If they stumble, there could be a second group of difference-makers on the trade market.
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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