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The phrase "a key of" is correct and usable in written English
It can be used when referring to an essential element or factor that unlocks or enables something, often in a metaphorical sense. Example: "Trust is a key of successful relationships."
Exact(59)
Then Mr Bevan, to everybody's entertainment, transposed his inquiries to a key of pure comedy.
He could work in a key of green and find the full spectrum in that color.
(She had hit a key of her computer after being stricken).
Putting the opponent's stronger forehand under pressure was also a key of Fish's serve and volley points.
This Singh, never more than a succession of bright headscarves, makes his predecessor in Kinng seem fully rounded; the action looks under-rehearsed; the songs, composed in a key of screeching pastiche, are dire.
They'd arrived fully medicated - gummy opium, mescaline and half a key of rolled joints, but all the dope in the world wasn't going to help a bummer like this".
In such a setup, you enter a key of 10 or 26 characters into the wireless access point or router (the hub of the network) and into each PC or Mac on the network.
But how likely is a key of AAAAAAAAAA really?
In this latest build, emoticons have a key of their own on the virtual keyboard.
Fig. 7 A key of the structure of the macrocosmos from Fludd (1618: 6).
A key of the calculation procedures is using the Leibnitz's rule (Appendix A of [43]).
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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