$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ $$$$$$$$$$$$$$$$$$$$$$$$$$$$ $$ $$ @$$$$$P Q$$$$$$$$$$$$$$$nnn$$$$$$$$$$$$$$$$$P $$$$ $$ $$ g$$p gnnn $$$$$$ $$$$$$ g$$p $$ $$ QQ @ Q$$$$$$ QQ $ $ QQ $$ QQ $ $$ $$ __ d$$$$p _ $$$$$$$p _ p$$$ $$$p _ p$$$$$$p _ _ $ $$ $$bnd$$$$$b I$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ $$$ $$$$$$$$$ $$$$$$$$$$$$$$$$$ $$$$$$$$P $$$ $$$$$ $$ $$ $$ $$ $$$$$ $$ $$$ $$$$$ $ $$$$ $$$$$ $$$$$