nnp≈p;p;;nn≈p;p;;;rs8≈p;p;;≈p;;
≈p;;n≈p;p;;pr≈p;p;;nn≈p;p;;100ns10s10srsbn≈p;p;;≈p;;
≈p;;p≈p;p;;nnsrp≈p;p;;nn≈p;p;;sr;srpssnnnssrr;sssnn;sr;≈p;p;;≈p;;
≈p;;≈p;;书籍订购≈p;;≈p;;
≈p;;nr≈p;p;;r≈