<b>(a)</b>
(define-syntax rotate
(syntax-rules ()
((rotate a) (void)) ; i.e., do nothing
((rotate a b c ...) (begin
(swap a b)
(rotate b c ...)))))
<b>(b)</b>
(begin
(swap n e)
(rotate e s w))
<b>(c) </b>
(begin
(swap n e)
(begin
(swap e s)
(rotate s w)))
<b>(d)</b>
(begin
(swap n e)
(begin
(swap e s)
(begin
(swap s w)
(void))))
 |
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