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Text File  |  1998-10-22  |  214b  |  10 lines
  1. retro-invert symbol-list
  2.  
  3. inverts symbol-list around its own retrograde
  4. that is: first symbol is inverted around last symbol
  5. second symbol around secondlast and so on.
  6.  
  7. (retro-invert '(a b c d e))
  8. ->(-e -b c f i)
  9.  
  10.