All other sets are rotations of these basic sets. They came from the basic 4 "For" statements that I mentioned earlier in the discussion in a comment to Richard. I suspect it's the ratio of 2 factorials.

I just had an interesting thought. If someone can reduce the number of operators or the number of number rotations & still pass the above test then it should still meet Jens criteria. It will be just like Howard dropping 3 bracket types & still getting the correct solution.

[ 25. September 2002, 04:04: Message edited by: Jack Lothian ]
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Jack