??? ???? ???? ??? ?? ??? ?? ???? ??? ??? ??? ??????.… ???? ??? ????? ?? ??? ??? ???? ?? ??? ?? ? ????? ???? ??? ?? ????. ?????? ? ?? ??? ?? ????? ?? ??? ??, ??? ??? ????? ????? ?????? ????? ?? ???? ???? ? ????. Some solvers also use graph paper to test various digit mixtures prio