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Discover LudwigThe phrase "a length of four" is correct and usable in written English.
It can be used when specifying a measurement or dimension, particularly in contexts like mathematics, programming, or descriptions of physical objects.
Example: "The password must have a length of four characters to be accepted."
Alternatives: "a size of four" or "a measurement of four".
Exact(46)
When the alligators reach a length of four or five feet, usually after about two years, Mr. Glass harvests them.
Between them, they delivered an instrument so sensitive that it could detect a variation smaller than the nucleus of an atom over a length of four kilometres.
Toads, frogs, and newts are common, and the endemic Japanese giant salamander of Kyushu and western Honshu can attain a length of four feet or more.
Length of the major axis was chosen to be seven pixels and the small axis a length of four pixels.
In this example the first array axis has a length of four but there are three MPI processes; hence, one gets a distribution of (2, 1, 1): The "fftw" distribution strategy is very similar to "equal" but uses functions from FFTW[8].
Savage calculated a length of four hours.
Similar(14)
They provide protection for the intellectual property for a length of twenty years.
A call to mmap may fail if the file open as fd has a length of zero bytes.
The largest and best-known species, Iguanodon, reached a length of nine metres.
From optical absorption spectra a length of six to eight CC bonds could be deduced.
Zhang chose a ruler of a length of seventy million, because a number that large made it easier to prove his conjecture.
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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