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The phrase 'that so' is not correct in written English.
It is likely that you intended to say 'therefore', which is the correct form of the word. For example: "We have discussed the options and reached a conclusion; therefore, we will proceed with the plan."
Exact(60)
"That so".
Is that so hard?
Is that so awful?
Was that so?
Is that so wrong?
Isn't that so true?
Is that so?
Isn't that so?
Is that so difficult?
Was that so bad?
Is that so terrible?
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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