instruction:
Two analogies that relate actions to the tools used to perform the action is given in the form "A : B. C : ?". "A : B" relates action A to tool B. Your task is to replace the question mark (?) with the appropriate tool for the given action C, following the "A : B" relation.
question:
eat : fork. vacuum : ?
answer:
vacuum


question:
spread : knife. unlock : ?
answer:
key


question:
wash : washcloth. wash : ?
answer:

soap