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Discover LudwigSuggestions(3)
The phrase "are the variations" is correct and usable in written English.
It can be used when inquiring about different forms or types of something, often in a context where variations are being discussed or analyzed.
Example: "In this study, we will explore what the variations are in the data collected from different sources."
Alternatives: "what the differences are" or "what the changes are".
Exact(30)
Just as significant are the variations in incomes within majors.
Also to be heard are the Variations, the compact biblical fable "The Flood" and "Requiem Canticles".
But then there are the variations, intended to help us tell these shows apart.
So great are the variations in ways of life, past and present, that comparisons among them are difficult.
Then there are the variations according to quality – purified sperm (which has been "washed" of seminal fluid) is more expensive, as is sperm from donors with higher motility.
His serve is by no means the biggest, yet such are the variations that it is one of the most difficult to read.
Similar(30)
Almost as numerous as the tests were the variations in Ana's diet.
Another advantage is the variation in shapes.
The simplest variation type is the variation set.
What shone through the study was the variation among teachers.
Another complication is the variation in how cannabis is delivered.
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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