Hi, I heard that and so that means the same thing, but it is most often so that instead of that. However, I was wondering if you could replace that with so that in any sentence. No.
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AlexandreAnotherusually after so,I would interpret the 'usually' as 'always' for purposes of modern English. There are cases of 'that of purpose' without the preceding so, but these sound very stilted and old-fashioned.