Two analogies that relate places/locations to the associated travel mode is given in the form "A : B. C : ?". "A : B" relates place A to travel mode B. Your task is to replace the question mark (?) with the appropriate travel mode for the given place C, following the "A : B" relation.

Q: store : car. office : ?

A: car
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Q: school : bicycle. park : ?

A: bicycle
****
Q: washington : train. island : ?

A:
boat
****