How to find thread prefixes?

[Robert9]

How to find thread prefixes?

I need to search for prefixes, but not with a given list;
i need to search for "Paris" to get the prefix_id.

Maybe someone has a tipp for me where to find a function for it?
I guess i have to search the phrases.

But maybe i should produce a lookup-table instead?
How to find thread prefixes?

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