How the line "Outter.this.x" works?

class Outter
{
    int x=20;
    class Inner
    {    int x=30;
        void show()
        {
            System.out.println(Outter.this.x);
        }
     }
      public static void main(String... s)
      {

       Outter k=new Outter();
       Outter.Inner m=k.new Inner();
       m.show();
      }
}

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