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The adder-subtractor circuit of figure has the following values for mode input M and data inputs A and B. In each case, determine the values of the outputs: $S _ 4 S _3 S _2 S _1$ and $C _5$.

M | A | B |

0 | 0111 | 0110 |

0 | 1000 | 1001 |

1 | 0101 | 1000 |

1 | 0000 | 1010 |