22.1.3.9 Examples of Printing Arrays

 (let ((a (make-array '(3 3)))
       (*print-pretty* t)
       (*print-array* t))
   (dotimes (i 3) (dotimes (j 3) (setf (aref a i j) (format nil "<~D,~D>" i j))))
   (print a)
   (print (make-array 9 :displaced-to a)))
>>  #2A(("<0,0>" "<0,1>" "<0,2>") 
>>      ("<1,0>" "<1,1>" "<1,2>") 
>>      ("<2,0>" "<2,1>" "<2,2>")) 
>>  #("<0,0>" "<0,1>" "<0,2>" "<1,0>" "<1,1>" "<1,2>" "<2,0>" "<2,1>" "<2,2>") 
=>  #<ARRAY 9 indirect 36363476>