Being a fairly bright AND sometimes an intelligent person, I pondered over this for the good part of almost 10 minutes.
I finally went into my old maths equations where "X" and "Y" were usually used in unknowns - until I finally conceded ignoble defeat and scrolled down without any grace whatever.....
Dinosaur? Malcolm Fraser, well before becoming prime minister when he said that his door was always open, went to buy his very first car which had suicide doors and were therefore also in danger of becoming Liberally punhinged, and because he didn't know how to drive anything so complex as a vehicle let alone a bargain, asked the car salesman for a driving lesson, so, before they'd even taken off, the salesman, after starting the engine, said to Malcolm: "If you watch me carefully now, Malcolm, I'll throw-in the clutch." So Malcolm, who only knew how to clutch at his wallet and straws, given he was fresh from the farm, stared at the salesman and said: "Hot diggedy, I knew if I held out long enough you'd likely feel pressured to have to throw-in something for free to sweeten the deal!"