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]: mop : mop. iron : ?
[EX A]: iron

[EX Q]: dig : shovel. vacuum : ?
[EX A]: vacuum

[EX Q]: vacuum : vacuum. crack : ?
[EX A]:
nutcracker