Don Berg
                                                                12/5/95
           SOLUTION TO THE 11TH HOUR BOOKSHELF PUZZLE

 The goal is to re-arrange the books (4-RED,4-GREEN) from the starting
 order to the ending order shown below.  Four moves are allowed, each
 move consists of selecting a pair of books (numbered 1-9) which will
 move to the current empty pair of slots.


Start:     R     G     R     G     R     G     R     G     -     -
  End:     -     -     G     G     G     G     R     R     R     R
          ___   ___   ___   ___   ___   ___   ___   ___   ___   ___
         |   | |   | |   | |   | |   | |   | |   | |   | |   | |   |
         |   | |   | |   | |   | |   | |   | |   | |   | |   | |   |
         |   | |   | |   | |   | |   | |   | |   | |   | |   | |   |
         |   | |   | |   | |   | |   | |   | |   | |   | |   | |   |
         |   | |   | |   | |   | |   | |   | |   | |   | |   | |   |
         |   | |   | |   | |   | |   | |   | |   | |   | |   | |   |
         |   | |   | |   | |   | |   | |   | |   | |   | |   | |   |
         |   | |   | |   | |   | |   | |   | |   | |   | |   | |   |
         |   | |   | |   | |   | |   | |   | |   | |   | |   | |   |
         |___| |___| |___| |___| |___| |___| |___| |___| |___| |___|
Pair:         1     2     3     4     5     6     7     8     9


 Perform four moves, by selecting these numbered book pairs in order:
                           2  5  8  1