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   _____     ___      ____     __   __    ______  
  / ___//   / _ \\   |  _ \\   \ \\/ //  /_   _// 
  \___ \\  | / \ ||  | |_| ||   \ ` //   `-| |,-  
  /    //  | \_/ ||  | .  //     | ||      | ||   
 /____//    \___//   |_|\_\\     |_||      |_||   
`-----`     `---`    `-` --`     `-`'      `-`'

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發送短信 : Skew-symmetric association schemes with two classes and strongly regular graphs of type L 2n-1(4n-1)