Glad you liked it and thanks for pointing out the tyop :)
I didn't print out the question clause because I threw this together rather quickly.
As for writing Prolog type programs, I want to play with this some more to better identify patterns in the code before I start refactoring it. Writing a filter when I'm still generating a proof of concept is a bit premature. Of course, if you want to play with this and extend it...
Typo on your post: s/Excelent/Excellent/; :)
Heading off for a three day weekend, so I won't be able to comment further.
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