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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