1324* +x֦ɴ +x֦ɴ +P S vɱ * iʮ κUɴɱ x `ɪ **1** **w*** {]xɪ ֺ +ɱ +Eɮ * nMv i +ɮ >xɪ **w** BE S = EɪɴSɨx * +xn ִxɨV jɪ **2** iE h +ɨ VE ƺɮ * >x ˴fE ʴ`S **3**


Oliұ MS +M Oliұ {fS +M +MS +vɪ