conversations.from: human
conversations.value: Corveus sleeps 4 hours a day and his doctor recommended for him to sleep 6 hours a day. How many hours of sleep does Corveus lack in a week?
  Solve this problem.
conversations.from: assistant
conversations.value: Corveus lacks 6 - 4 = 2 hours of sleep every day.
  Therefore, Corveus' total hours of lack of sleep every week is 2 x 7 = 14.