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Some thought is needed in order to come up with a good algorithm.
Dear Clive, thanks a lot! This one is what I call "jaw-dropping" in my thoughts, in relation to some of yours puzzles or those by Mathias. I mean that first impression after reading the statement is like "how at all there could be any connection which allows calculate this for the range" etc :) Perhaps I should start with pencil and paper as you teach...