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The circuit performs the function of adding two binary digits. Using the two input bits the circuit produces the Sum (SUM) and Carry Output (CARRY). SUMf will be set if either, but not both, of the input variables is 1. CARRY will be set if both of the input variables are 1. A two-input Exclusive OR (XOR) gate and a two-input AND gate were used to generate SUMand CARRY respectively.