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Discover LudwigSuggestions(5)
The phrase "a number of key" is not correct as it is incomplete and lacks a noun to follow "key." You can use it when referring to several important elements or factors, but it needs to be completed with a noun.
Example: "A number of key factors contributed to the success of the project."
Alternatives: "several important" or "a few critical".
Exact(60)
However, a number of key differences emerged.
We have therefore made a number of key recommendations.
A number of key drama series have performed poorly recently.
A number of key episodes feature Aboriginal characters and symbols.
A number of key lessons were provided by Black Wednesday.
Nevertheless, a number of key themes emerge with regularity.
A number of key executives have recently left.
The Golden Boot holder was among a number of key players left out last week.
We have played India a few times and they have got a number of key players.
Prior to joining Improve Digital, he held a number of key sales roles at Dennis Publishing.
But even under Hamdi, a number of key issues remain undecided.
More suggestions(24)
a number of key trends
a number of key causes
a number of key improvements
a number of keys
a breakdown of key
a proportion of key
a number of landmark
a quantity of key
a number of press
a number of pivotal
a number of keyword
a multitude of key
a number of core
a number of keynote
a number of essentials
a number of essential
a number of keys
a number of instrumental
a number of primary
a number of prime
a number of substantial
a timeline of key
a list of key
a Heatmap of key
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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