ƚ  ] U .   &@ & MathTypeSymbol ؟ww w f-2 ":y2 :y2 :y2 D+y2 8=y2 ,-y2 8=yTimes New Roman؟ww w f-2 @1y2 p2y2 "1y2 d3yTimes New Roman؟ww w f-2 Hxy2 yy2 0xy2 yy & "System f !-