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| 5 Data and Control Flow 5.1 Generalized Reference 5.1.1 Overview of Places and Generalized Reference 5.1.1.1 Evaluation of Subforms to Places ### 5.1.1.1.1 Examples of Evaluation of Subforms to Places
     (let ((ref2 (list '())))
       (push (progn (princ "1") 'ref-1)
             (car (progn (princ "2") ref2))))
    12
     (REF1)

     (let (x)
        (push (setq x (list 'a))
              (car (setq x (list 'b))))
         x)
     (((A) . B))
push first evaluates `(setq x (list 'a)) (a)`, then evaluates `(setq x (list 'b)) (b)`, then modifies the car of this latest value to be `((a) . b)`.

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