Negatives: Not sufficient charts. Some methods are hard to compute manually and demand a wide range of effort to take care of. ?? ??? ?? ????? ??? ?? ?? ???? ?? ???????? ???? ???? ??? ?? ?? ????? ????? ?????? ?? ????? ???? ????? ????? ????? ???: ?? ???? ??? ???? ??? ??? ???? ??????? ????? ?? ????