Since the specific logic circuit diagram is missing from the question, we deduce the equivalent gate based on the provided probable answer. A logic circuit equivalent to a NOR gate produces a high output (logic 1) only when both of its inputs are low (logic 0). If any or both of the inputs are high (logic 1), the output is low (logic 0). The Boolean expression for a NOR gate is $Y = \overline{A + B}$.