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The phrase 'which that' is not correct for use in written English.
You cannot use it as it does not make grammatical sense. Instead, you can use the word 'that' on its own if you need a pronoun to refer to an earlier noun or phrase. For example: I love the movie "Coco" - that was the best one I've ever seen.
Exact(55)
There are ways in which that could happen, though.
Is there any decade about which that can't be said?
Here are some ways in which that could be done.
You could easily have made a creation in which that didn't exist.
The rigour and the vigour with which that was tackled was exemplary.
There are no roads, only dirt tracks which that turn greasy in the rain.
Conscientiously, the museum declined to support the reactionary work to which that movement ultimately led.
It's that we have a system in which that makes such a difference.
Similar(3)
Speaking of which … that gun?
And the assumptions on which that projection is based are highly dubious.
But it's also crucial to uphold the ideals upon which that government rests.
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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