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Satsifactory in this context is good, not bad.

We live in a euphemistic world where "satisfactory" is presented to failures to not hurt their feelings, but the word also and originally means it's good enough, i.e. delivers an unbiased shuffle.

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But it's not just good enough, it's optimal. It is equivalent to picking a random deck from the set of all possible decks assuming your random source is good. More random than a real shuffle.

Right and that’s what satisfactory means, the condition was satisfied.

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