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Discover LudwigThe phrase "a supplementary key" is correct and usable in written English.
It can be used in contexts related to databases, security, or any situation where an additional key is needed to enhance or support a primary key.
Example: "In our database design, we decided to implement a supplementary key to improve data retrieval efficiency."
Alternatives: "an additional key" or "a secondary key".
Exact(1)
Some so-called double-distribution machines permit two magazines to be used at once by pressing a supplementary key.
Similar(59)
It offers a different –a supplementary– set of standards".
It can achieve fast convergence and high quality of the recovered image and can provide a higher degree of freedom in key space with more parameters as supplementary keys.
The leaflet was not designed to be an alternative to current information materials but rather a supplementary resource to address key beliefs about CRC screening that can act as barriers or motivators to uptake with the purpose of enhancing intention to be screened.
A supplementary test probing knowledge of key signatures and the notation of the clef was administered to W.W. and healthy musicians.
Part B is a supplementary insurance that covers outpatient services.
Eventually, Quinn hopes to create a supplementary newspaper comic strip.
Fishing is a supplementary activity.
Bishop is back with a supplementary.
a supplementary document).
Which means everything else is a supplementary, secondary device.
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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