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Remember three rules:
1. Sufficient satisfied, necessary must be as well. (Conditional argument)
2. Necessary failed, sufficient must be as well. (Contrapositive argument)
3. Merge together the same symbol to create a chain. (Chaining conditionals)
Remember three traps:
1. Sufficient failed yields no information about the necessary.
2. Necessary satisfied yields no information about the sufficient.
3. Do not confuse sufficiency for necessity.
Group 1 (sufficient): if, when, where, all, the only, every, any
Group 2 (necessary): only, only if, only when, only where, always, must
Group 3 (negate, sufficient): or, unless, until, without
Group 4 (negate, necessary): no, none, not both, never, cannot
If helpful, kick ideas up into the domain, transform embedded conditionals into conditionals with conjunctive sufficient conditions, and use the Rule + Exception framework.
break up confusing answer choices by separating conclusion descriptors from premise descriptors