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

 ______      ___     _____      ______   __   __  
|      \\   / _ \\  |  __ \\   /_   _//  \ \\/ // 
|  --  //  | / \ || | |  \ ||   -| ||-    \   //  
|  --  \\  | \_/ || | |__/ ||   _| ||_    / . \\  
|______//   \___//  |_____//   /_____//  /_//\_\\ 
`------`    `---`    -----`    `-----`   `-`  --`