???? ????? ? ???? ???? ? ????? ?????? ???? ? ?????‌??? ??????? ? ???? ??? ??????? ??????? ?????? ? ??? ???? ?????? ????? ? ???? ????? ? ????? ????? ???? ??????‌??? ????? ??????? ??????‌??? ????? ????????????‌ ???? ?? ??????? The usage of vegetable oils, a much more efficie