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My rule of thumb, which I originally read on this site a long time ago, is that it's a double foul (or simultaneous) if they happen quickly enough that you don't have time to spit the whistle out.
If you call one foul and have enough time to spit out the whistle and have to put it back in to call the second one, it's false double.
It's not perfect, but it works for me.
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