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If the sufficient is satisfied, the rule triggers the necessary.
If ... the necessary is satisfied, then the opposite (logical negation) of the sufficient ... sufficient is not satisfied, the rule is irrelevant (still check the necessary ...
... we have learned, "only" indicates necessary condition. So we have: DSI ... does this. "Unless" indicates negate sufficient. So negate the first part ... it sufficient, leave the second part alone and as the necessary. You ...