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If they spend all night writing computer programs, Laurence can write 10 programs, and Carrie Anne can write 5. If they spend all night making sunglasses, Laurence can make 6 pairs, and Carrie Anne can make 4. We know that has a comparative advantage in O Laurence; programs O Carrie Anne; programs O Laurence; both programs and sunglasses O Carrie Anne; both programs and sunglasses