A "no-brainer" or super-obvious reasoning-conclusion dat even a dimwitted lunkhead should conceivably be able to figger out on his own.
In E.A. Poe's classic detective-novel "The Purloined Letter", da wily Auguste Dupin is able to make a simple deduhction as to da letter's location' something dat da methodically-overthinking and "arbitrarily operating by da book" police chief had been unable to puzzle out himself.
by QuacksO January 20, 2020