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@If a person is drinking beer in a bar, then the person must be over 18 years old.
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@If a person is drinking beer, then that person must be over 18 years old.
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@If a person is drinking beer in a bar, then the person must be over 18 years old.
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These four people are all having a drink. You can check their age or their drink. Who should you check to make sure that the rule is observed?