Madruga,
Finding, something that has only one solution means that I have to rerun the test 5 times because I set the brackets permutations as the outside loop & I then set the priority order for the permutations. I would need to do 1 run with each bracket type at the end of the priority order. Painful - I would rather not since each run takes 2 hours. None of my previous runs are helpful since they all contained the no bracket case as the number 1 priority which is clearly wrong.
In my posted sample output above, I believe all outputs of the form "(a b) c d" & "(a b)(c d)" are unique solutions to that form. Since only 4 cases of "a (b c d)" were found they are also probably unique. As to the other cases??
[ 25. September 2002, 03:22: Message edited by: Jack Lothian ]
_________________________
Jack