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`timescale 1ns / 1ps

module test_f3_neg;

    // Inputs

    reg [1:0] A;

    // Outputs

    wire [1:0] B;

    // Instantiate the Unit Under Test (UUT)

    f3_neg uut (

        .A(A),

        .B(B)

    );

   task check;

      begin

         #10;

            if ((A+B) % 3 != 0)

               begin

                   $display("Error"); $finish;

                end

      end

    endtask

    initial begin

        // Initialize Inputs

        A = 0;

        // Wait 100 ns for global reset to finish

        #100;

        // Add stimulus here

        A = 0; check;

        A = 1; check;

        A = 2; check;

        $finish;

    end

endmodule