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    /* ADD, OP=10 */
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    /* ADD, OP=10 */
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    /* SUB, OP=11 */
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    /* SUB, OP=11 */
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    NOT_1 not1 (b, w_binv);
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    NOT_1 not1 (b, w_binv);
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    Mux2 m_binv (b, w_binv, op[1], w_adder_b);
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    Mux2 m_binv (b, w_binv, op[1], w_adder_b);
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    OneBitAdder add (cin, a, w_adder_b, cout, w_add_out);
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    OneBitAdder add (cin, a, w_adder_b, cout, w_add_out);
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    /* MUX the output together */
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    /* MUX the output together */
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    Mux4 resMux (w_and, w_or, w_add_out, w_add_out, op, result);
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    Mux4 resMux (w_and, w_or, w_add_out, w_add_out, op, result);
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endmodule
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endmodule
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