??????? ??????? ??? 4 ???? ??????? ????? ?? ???????? ?????? ?????? ??? ???? ??????? ??? ???? ?? ??????? ??? ???? ????? ????? ????? ?? ???????? - Detailed Explanation ??????? ??????????????? ??????????????? ?? ???????????? ??????? ???????????? ??????? ?? ??????????????? ????? ?? ???????????? ??????? ?? ????? ?? ???? ??????? ?????? ????? ?????? ???