Background
T PP+ PP+PP+ PP+PP+ PP+PP+ 8P+8++ 8Q+8Q+ 8 Q+80Q+ 8@Q+8PQ+ 8`Q+8pQ+ 8Q+8Q+ 8Q+8Q+ 8Q+8Q+ 8Q+8Q+ R+H++ HR+H R+ H0R+H@R+ HPR+H`R+ HpR+HR+ HR+HR+P+0+ R+R+ R+R+x+@+ xR+xS+