((S
  (Stmt
   (Exp
    (Matrix
     (Matrix
      (Matrix
       (Matrix
        (Matrix
         (Matrix
          (Matrix
           (Matrix (Matrix (Matrix . "A") (Matrix . "A")) (Matrix . "A"))
           (Matrix . "A"))
          (Matrix . "A"))
         (Matrix . "A"))
        (Matrix . "A"))
       (Matrix . "A"))
      (Matrix . "A"))
     (Matrix . "A"))))))