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$$A = 0, B = 0$$: Neither path bypasses the indicator; current flows through the LED ($$Y = 1$$).
$$A = 1$$ and/or $$B = 1$$: The switch paths close, short-circuiting the voltage across the LED ($$Y = 0$$).
This inverse relationship ($$Y = \overline{A + B}$$) defines a NOR gate.
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