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knowledge of vs knowledge on

knowledge of vs knowledge on which is much better to use in a sentence. Which is more popular in English form?

Looking on the internet deeply has found these results:

knowledge of is the most popular phrase on the web.

knowledge on

143,400,000 results on the web

knowledge of

1416,000,000 results on the web

More popular!

Some examples and use cases from the internet:

Some examples and use cases from the internet:

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