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In which year did Albert Einstein pass away?

Please take a look at this code:
      int a = 2;
      int u = "NAF".hashCode() % 3000;
      int r = "NFE".hashCode() % 3000;
      for (int j = 0; j <= r; j++)
         a = (a ^ j) % u;
      return a;
What is the returned value?

What is the greatest common divisor of the previous two results?

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