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CLHS: Section 22.1.4

 (let ((*print-escape* t)) (fresh-line) (write #\a))
>>  #\a
=>  #\a
 (let ((*print-escape* nil) (*print-readably* nil))
   (fresh-line)
   (write #\a))
>>  a
=>  #\a
 (progn (fresh-line) (prin1 #\a))
>>  #\a
=>  #\a
 (progn (fresh-line) (print #\a))
>>  
>>  #\a
=>  #\a
 (progn (fresh-line) (princ #\a))
>>  a
=>  #\a

 (dolist (val '(t nil))
   (let ((*print-escape* val) (*print-readably* val))
     (print '#\a) 
     (prin1 #\a) (write-char #\Space)
     (princ #\a) (write-char #\Space)
     (write #\a)))
>>  #\a #\a a #\a
>>  #\a #\a a a
=>  NIL

 (progn (fresh-line) (write '(let ((a 1) (b 2)) (+ a b))))
>>  (LET ((A 1) (B 2)) (+ A B))
=>  (LET ((A 1) (B 2)) (+ A B))

 (progn (fresh-line) (pprint '(let ((a 1) (b 2)) (+ a b))))
>>  (LET ((A 1)
>>        (B 2))               
>>    (+ A B))
=>  (LET ((A 1) (B 2)) (+ A B))

 (progn (fresh-line) 
        (write '(let ((a 1) (b 2)) (+ a b)) :pretty t))
>>  (LET ((A 1)
>>        (B 2))
>>    (+ A B))                 
=>  (LET ((A 1) (B 2)) (+ A B))

 (with-output-to-string (s)  
    (write 'write :stream s)
    (prin1 'prin1 s))
=>  "WRITEPRIN1"

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