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.

[EX Q]: stir : spoon. unlock : ?
[EX A]: key

[EX Q]: crack : nutcracker. type : ?
[EX A]: keyboard

[EX Q]: vacuum : vacuum. unlock : ?
[EX A]:
key