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module MUX(A,D0,D1,D2,D3,F);
input [1:0] A;
input D0,D1,D2,D3;
output reg F;
always@(A or D0 or D1 or D2 or D3);
        case(A)
                2'b00:F<=D0;
                2'b01:F<=D1;
                2'b10:F<=D2;
                2'b11:F<=D3;
        endcase
endmodule
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