Sorry, 
In my code, there is (car l) but of course it should be (car selectors).


 (let ((loop (gensym)))
      `(let ,loop ((selectors (,seek2 (quote ,@body)) )) ;;list of selectors
        (cond ((null? selectors) (,@body))
              (else
                (define (car selectors)
                 (defines3 (string->list
                            (substring (car selectors) 2
                                    (- (string-length (car selectors))1)) )))

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