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.
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Question: type : keyboard. dry : ?

Answer: cloth


Question: wash : rag. type : ?

Answer: keyboard


Question: unlock : key. sweep : ?

Answer:
broom