GIF89ag!,gڋM<}xI'@(jٙ9)rBLQ"2i~P&ڪZb[wBcc5os^=TW#g'G4X2eҘ)B$W*R:Y5H(x1k4 <|6\Rkl1 ì -=S! MathType0018 B 1 =b 1 >1/2;