ƚ M  .  & & MathType-@":b  b Times New Romanww 0w2 f-2 122 nq122  242 n4 242 |242 nj182 T242 nT202 402 n302 T602 nT50Symbol ww 0w2 f-2 ` =02 `| =02 `<-02 `=02 `|-0 & "System2 f !-