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  _____     _____     ______   __   __    _____   
 / ____||  |  ___||  /_____//  \ \\/ //  / ____|| 
/ //---`'  | ||__    `____ `    \ ` //  / //---`' 
\ \\___    | ||__    /___//      | ||   \ \\___   
 \_____||  |_____||  `__ `       |_||    \_____|| 
  `----`   `-----`   /_//        `-`'     `----`  
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發送短信 : For multi-interval-valued fuzzy sets, centroid defuzzification is equivalent to defuzzifying its interval hull: A theorem