??? ????, ?????, ???? ?? ????? ???????? ???? ????? ???????? ???????? ????? ??? ?? sign ? ???????? ??? ????????. ??? ?? signs ? ??????? ?????????????? ???????? ?????????? ???? ?????? ??? ?? ???? ??? ????? ????. ????? ??????? ???? ??? ?????? ??? ??? ?????? ???? ???? ?????? ?????????????? ??? ??????? ?????? ?????? ?????? ?? ??? ??????????:

??? ?? signs ? ???????? ?????? ??????????????, ???????? ?????????? ???? ???? ??????? ?????? ?????? ?????: ????? ????? ???? ????, ?????? ????? ???? ????, ???? ??????? ???? ????, ??????? ??? ???????? ???????? ??? ?? ???? ????, ????????? ???? ??????? ???? ??? ?? ???? ????, ???? ???? ???? ?? signs ? ???????? ?????? ??????????? ?? ?? ?????? ????????? ??????.

????? background ? ??????? ???? ????:

????????? ????? ?? ????? ???? ????? ???? solid ? ??????? ???? ???? ???? ??????? ????:

1. ???? ???? ????? ??????? ????, ??????? ????? ????? ?? ??????? ?????? ????, ?? ??????? ???????? ???????? ?????.

2. ????? ??????? ?????? ?? ??????? ????????, ????? ?????? ??????????????? ?????? ????;

3. ????? ????? ?? ????? ?????? thickness ??? ?????? ?? ????? ???????? ????.

????? ?????:

????? ???? ?? bottom ? ???? ??????, ?????????? ?? ???? ???? ???? ??????? ???? ??? ????? ??:

1. ???? ?????????? ?????? ??????? ?;

2. ????? ????????????? ??????? ?;

3. ????? ???????? ?????? ????????????, ????? ???? ?? ?? ???? ??????? ??? ???? ?????, ????? ???????????????.

???? ??????? ?? ???? ????:

???? ??????? ?? ???? ???? ??????? ?????? ?????????:

1. ??????? ?????, ?????, ?????? ????????, ????????????, ??? ???? ?????? ?????? ???? ?????? ?????????? ??? ???? ????? ?? ??????;

2. ?????? ??? ???? ????? ?? ?????? ??? ??? ???? ???????? PS ??????? PS ?????? ???? ?????? ???????????? ??? ????? ???????.

???? ???? ??? ?????? ??? ????????? ?? ????, ??????? ????? ????? ???? ??? ???????? ?????? ???????????? ???? ??????? ??????? ???????.

??? ?????????? ??? ?? sign ? ??????? ???? ??????, ?? ??? ??? ???????? ??? ?????? ??????????? ????. ??? ??????? ??? ????? ?????????????? ???? - ?????? ????????, ?????? ??? ?????? ???????? ?????????!