Represent C in terms of A 1 , A 2 , A 3 , and A 4

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Represent C in terms of A1, A2, A3, and A4?

Consider a family with a mother, father, and two children. Let A1 = {mother has influenza}, A2 = {father has influenza}, A3 = {first child has influenza}, A4 = {second child has influenza}, B = {at least one child has influenza}, C = {at least one parent has influenza}, and D = {at least one person in the family has influenza}.

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