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The output of the circuit in the figure is equal to

  1. $0$
  2. $1$
  3. $\overline{\mathrm{A}} \mathrm{B}+\mathrm{A} \overline{\mathrm{B}}$
  4. $\overline{(\mathrm{A} * \mathrm{~B})} * \overline{(\mathrm{A} * \mathrm{~B})}$
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