On further testing, I found that /:pv is the inverse permutation for both grade up and grade down,
 pv=. /:p and pv=. \:p

Is the inverse permutation stable for both cases, grade-up and grade-down?


bill lam wrote:
Raul Miller wrote:
ipv=: /: pv

Thank you, I didn't realize that is so simple.


--
regards,
bill
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