+---+--+---+ +---+---+---*---+ 1A |1 +--+ 14| VCC | A | B | C | Y | Y = ABC 1B |2 13| 1C +===+===+===*===+ 2A |3 12| 1Y | 0 | X | X | 0 | 2B |4 7415 11| 3C | 1 | 0 | X | 0 | 2C |5 10| 3B | 1 | 1 | 0 | 0 | 2Y |6 9| 3A | 1 | 1 | 1 | Z | GND |7 8| 3Y +---+---+---*---+ +----------+