20???100 ??????? ???? c? h?i ??! ??????? -20 ??? 100 ??? ?????????? ??? ?? ?????????????? ???????? ????? ?????? ??? ????????? ??? ??? ?????????? ??? ???????? ?????? ??????? user-friendly ???????? ????????????! 20 ??? ????? 100 ??? ???????? ?????????? ??????? ???????? ???? ????? ?????? here ????? ????? ??????