2237* +xxɺ `ɴ BE ɴEV * BEʴh nV xh Sk **1** **w*** x {֮i +ɳ nvb ɴ * Eɪ ɮ niɺ **w** ES ɮ =S ʶɮ * xf i n֮ vʮʱɪ **2** iE h Ei Piɱ Ƥh * ɨl =x Efɺ] **3**


Oliұ MS +M Oliұ {fS +M +MS +vɪ