thank you for pointer, a related question from that page

why this work
  (<tgrade x) {&.> x
but this will give length error
  (tgrade x) {&.> x

I usually use the pattern (tgrade x)&{&.> x

Sherlock, Ric wrote:
Have you checked Roger's Inverted Tables on the wiki? There's a section
there on grading & sorting.
http://www.jsoftware.com/jwiki/Essays/Inverted_Table

--
regards,
bill
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