premise: A company's six vehicles—a hatchback, a limousine, a pickup, a roadster, a sedan, and a van—are serviced during a certain week—Monday through Saturday—one vehicle per day. The following conditions must apply: At least one of the vehicles is serviced later in the week than the hatchback. The roadster is serviced later in the week than the van and earlier in the week than the hatchback. Either the pickup and the van are serviced on consecutive days, or the pickup and the sedan are serviced on consecutive days, but not both. The sedan is serviced earlier in the week than the pickup or earlier in the week than the limousine, but not both. If neither the pickup nor the limousine is serviced on Monday, then which one of the following must be true?
hypothesis: The van is serviced on Monday.