????? ????? ????? ???? ???? ???????? ?? ?? ???? ??? ?????? ???????? ???? ??? ????????????? ??? ?? ?????? ??? ?? ???????, ?????????? ???? ????? ??? ???? ??????? ??? ??????? ??? ??? ????? ???.Equipment with quite a few switches (like a computer keyboard) usually organize these switches within a scan matrix, with the individual switches on the interse