module problem2(a,b,c,d,out);
    input a,b,c,d;
    output out;
    assign out = (c & (a | b | d));
endmodule

module test_problem;
    reg [3:0] count;
    wire out;

    problem2 p2(count[3],count[2],count[1],count[0],out);

    initial begin
        count = 4'b0000;
        repeat (16) begin
            #100
            $display("In = %b, out = %b ", count, out);
            //$display("A is = %b, B is = %b, C is = %b, D is = %b", count[3], count[2], count[1], count[0]);
            count = count + 4'b0001;
        end
    end
endmodule