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Discover Ludwig"once require" is correct and usable in written English
You can use it to indicate that something requested or demanded once, is still necessary or in effect. For example, "The book once required in our literature class is still in high demand."
Exact(4)
According to the Times, he dodged four questions and was fact-checked five times by the moderator; Clinton dodged nothing and did not once require fact-checking.
This means you'll be able find favorites by name or characteristics, a feat that once require prodigious amounts of data entry.
However, if cells that have proliferated once require a refractory period before they undergo additional rounds of proliferation [30], despite the existence of limited highly-proliferating cells, the numbers of double-labeled cells may still remain low.
Although CNVs that were observed once require further confirmation, some of them represent true CNVs.
Similar(56)
Such work once required planes, trains, horses and canoes.
Companies' purse strings, which once required a gentle tickle to loosen, now often require a crowbar.
In and around Salt Lake City, 16 of the 40 schools that once required uniforms have dropped them.
Making ice cream at home once required lots of ice and rock salt.
A single bomb could now destroy a target whose elimination had once required thousands of bombs.
Large billboards once required the touch of artisans to paint every detail.
A pursuit that had once required arcane knowledge was now within reach of any enthusiastic amateur.
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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