In"Right on Time" courier service, during an autumn day, a courier has to deliver six packages- Hurricane, Torpedo, Cyclone, tornado, Typhoon and Thunder. He delivers no other packages, and no two packages are delivered at the time.the order in which the packages are delivered conforms to the following conditions:
- Hurricane is neither delivered first nor delivered last.
- Cyclone is delivered before Tornado
- Thunder is delivered after Tornado is delivered
- Typhoon and Cyclone are delivered in immediate succession, regardless of weather Typhoon or Cyclone is delivered first.