WOW thanks heaps for your help (both of you )
Finally wrote my static heuristic evaluation function for C4
CL-USER> (set-difference '(1 2 3 4 5) '(3 4))
(5 2 1)
There is no guarantee that the order of elements in the result will reflect the ordering of the arguments in any particular way. The result list may share cells with, or be eq to, either of list-1 or list-2, if appropriate.
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