instruction: What are some ways of traveling from Washington D.C to San Francisco?
response: - take a direct flight
  - drive cross country on paved roads with a car
  - drive cross country on dirt roads with a car
  - ride cross country on dirt roads with a motorcycle
  - ride cross country with a bicycle
  - take a ship through the panama canal
  - walk cross country
  - take a bus
  - take a train
  - hitchhike 
  - combine any of the following methods