????? ??????? ????? ?????? ?? ??????????? ????? ???? ??????? ?? ???? ??? ??????? ???????? ???.???? ?? ???????? ???? ???? ??? ??????? ??????? ?? ????? ?????? ???? ????? ??????? ???????????? ????? ????? ???? ???? ???? ???? ????? ??? ???? ????? ??????? ???? ??????? ?? ???? ???? ??? ????? ???? ?????Hassan, an excellent aviation engineer struggles with