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Discover LudwigThe phrase 'an extra of' is not correct or usable in written English
It is not a standard phrase or idiom in the English language.
Exact(8)
This provides an extra of three resistivities within the range of 10−3 to 101 Ω cm.
It's essentially a collection of DVD extras and commentary, but it's cut together like an extra of sorts, hence the 2.5.
On average, surveyed consumers are willing to pay an extra of 5.16 Yuan ($0.82) for Chinese pistachios, and 5.09 Yuan ($0.81) more for California pistachios compared to the Turkish alternative.
Just bring an extra of each for the hotel safe deposit box in case the others are lost or stolen.
The waterless urinals were part of the plan to make the Comcast Center an environmentally friendly building because they would save an extra of water a year.
The booster engines cut off 2 seconds earlier than planned, but the sustainer engine burned for about 10 seconds longer than intended, giving an extra of velocity and putting the spacecraft in a slightly higher orbit than planned.
Similar(50)
The addition of an extra copy of a single chromosome initially decreased cellular fitness.
There is an extra layer of anxiety born of experience.
Including an extra copy of the Internet!
They provide an extra splash of publicity.
Pack an extra suitcase of patience.
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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