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  / ___//   / _ \\      ___     / _ \\  |      \\ 
  \___ \\  / //\ \\    /   ||  / //\ \\ |  --  // 
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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