ƚ S  .  & & MathType-@>f   Times New Romanww 0wk f.-2  5y2 n 4y2 % 5y2  3y2 n( 4y2 n 3y2 Y152 nV122 .152 n452 0152 n85Symbol ww 0wk f.-2 `h =52  52  /52 n 52 n /52 `V=52 `(=52 `+5 & "System.k f. !-