TASK DEFINITION: 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.
PROBLEM: spread : knife. wash : ?

SOLUTION: soap

PROBLEM: unlock : key. toast : ?

SOLUTION: toaster

PROBLEM: cook : stove. iron : ?

SOLUTION:
iron