ƚ PL  .  &D & MathTypePSymbol p؟ww w f-2 5(ySymbol p؟ww w f-2 )y Times New Roman؟ww w f-2 T62y2 T2y2 T2 6y2 T2y2 T 2y2 2y2 T3yTimes New Roman؟ww w f-2 G 162 E462 46Times New Roman؟ww w f-2 ay62  x62 a y62 x62 txySymbol @؟ww w f-2 9 =y2  =y & "System f !\-