Any airline passenger with the letters “SSSS” printed on their boarding pass has been selected by airport security for extra screening.

Any airline passenger with the letters “SSSS” printed on their boarding pass has been selected by airport security for extra screening.

Unfortunately, she has also forgotten the four-digit code to her house. This shouldn’t be a problem, because she keeps a code clue in her wallet. It says: “Four times the car’s four-digit ...