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The phrase "voluntary in" is not grammatically correct or usable in written English.
You would need to provide more context and revise the phrase to make it sound more grammatically correct. For example, you could say, "He was very voluntary in his work," or "She took part in the project voluntarily."
Exact(57)
The programme is compulsory in 20 states but voluntary in Florida.
Inside both Enron and Vinson & Elkins, political giving often seemed voluntary in name only.
It is voluntary in the UK, but is now legally required in the US.
So far, company-sponsored recycling efforts are voluntary in the United States.
Price cuts by the multinational companies have been voluntary, in response to public indignation and counteroffers from generic producers.
Although the program's use is mandatory in some states, its reliability has been debated, and it remains voluntary in California.
Adherence is voluntary in all states except Queensland and the ACT, which have set the acceptable hen density at 10,000 and 1,500 birds per hectare respectively.
Because I have my father's dark hair and eyes, the choice to be Hispanic was not entirely voluntary in my early years.
He added: "If you just take away the word voluntary in the House bill, I think you've got a better bill".
Similar(2)
He is astonished to realise that he is one of the very few people actually forced to be there: the rest are voluntary in-patients who have become institutionalised.
Case 1 represents a voluntary in-patient who assaults a staff member, case 2 an involuntary patient who does not behave violently but refuses medication.
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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