Pilot mike I salute you also, the force is strong with you but WOOD FOR TREES
As nobody can twig what the examiner wanted, and we've all branched out to get to the root of the problem, possibly we are all barking up the wrong tree? In which case yew or I could be right fir now, and I wood suggest that we leaf it there rather than stick at it any longer, before everyone gets sycamore of this maths.
PM