Engineer Bob parks his car in a public parking lot. Getting out of the car, he sees a sign that reads: “After parking, driver must pay the cashier and identify the parking slot by the number painted on the concrete.”

Yesterday, four gangsters were arrested by the police. One of the four was suspected of having murdered a policeman during a heist. Each one made two statements under Interrogation. Note that they all have gruesome nicknames.

There are 3 boxes – A, B, and C – containing 11 ties in total, all white or black. The boxes are labeled, but we were told that someone switched the labels on the 3 boxes. They are now all incorrectly labeled.