ƚ` p[  .  `& & MathTypePSymbol6 ؟ww w f-2 3(ySymbol ؟ww w f-2 c)yTimes New Roman؟ww w f-2 8y2 1y Times New Roman؟ww w f-2 2ySymbol6 ؟ww w f-2 =y2 +yTimes New Roman؟ww w f-2 xy & "System f !-