??? ???? ???? ??? ?? ???‌??? ??????‌??? ?? ???? ??? ?????? ????? ??? ?? ?? ??? ???? ?????? ??? ?? ???? ???? ???. ??? ?????? ?? ??? ???‌?? ?? ????? ???‌???? ??????? ? ???‌??? ?????? ?????? ???? ???? ????? ??????? ??? ?? ??? ???. The latter is the principle component cons