[racket] why is the 'above' command not recognized?

(define BDY
    (above
      (rectangle (/ BODY-LENGTH 2) (/ BODY-HEIGHT 2)
                 "solid" "red")
      (rectangle BODY-LENGTH BODY-HEIGHT "solid" "red")))

Teachpacks: gui.ss, image.ss, universe.ss, and batch-io.ss.
above: name is not defined, not a parameter, and not a primitive name

any reason "above" is recognized?



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