[plt-scheme] HTDP 12.4.2

So, if we are holding onto:

    (list (list 'd 'r 'e)
          (list 'r 'd 'e)
          (list 'r 'e 'd))

and we want to mess with it enough so we get:

     (list (list 'd 'e 'r)
           (list 'e 'd 'r)
           (list 'e 'r 'd)
           (list 'd 'r 'e)
           (list 'r 'd 'e)
           (list 'r 'e 'd))

do you see what the difference between what we're holding onto and what we 
want is?  Can you give a concept or name to it?

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The difference is (first alow) - Right.