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

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Text this: Equivalence classes and canonical forms for two-qutrit entangled states of rank four having positive partial transpose