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|      \\  \ \\/ //   / ___//   / _ \\   | \| || 
|  --  //   \ ` //    \___ \\  / //\ \\  |  ' || 
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|______//    |_||    /____//  |_||  |_|| |_|\_|| 
`------`     `-`'   `-----`   `-`   `-`  `-` -`

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發送短信 : A Course in Commutative Banach Algebras