I wrote it in kixtart & the math routine is very messy but it completes in about 2 hours.
The important question is: Is everyone aware that "(a b) c d" and "(a b c) d" are necessary to derive all solutions?
Your analysis implies that you only need brackets for 18 of your 466 solutions. My results suggest that exactly half of the solutions absolutely require brackets.
[ 25. September 2002, 01:16: Message edited by: Jack Lothian ]
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Jack
