?????? ?? ???? ?????? ??? ???? ??? ?? ??? ?????? ??????? ?????, ????? ???? ???? ??????? ??????, ??????, ??????, ????, ?? ??? ?? ???? ????? ??? ????????.My focus is on another thing now. This book is fine but I do not advocate it any more but other publications alternatively...The key says really firmly which you could, in fact need to be, on top of