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public static class MyExtensions {
  private static Random _random = new Random(); 
  
  public static bool IsMnogo(this object value) {
    try {
      var n = double.Parse(value.ToString());
      return n > 9999999999;
    } catch {
      return true;
    }
  }
  
  public static bool IsDavno(this DateTime value) {
    return value < new DateTime(1900 + _random.Next(10, 90), 04, 17);
  }
}
                                    
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