instruction:
Two analogies that signify affordances are given in the form "A : B. C : ?". Affordance is the possibility of an action being done on an object, for example book is an affordance of writing. The phrase "A : B" implies that B is an affordance of A. Your task is to replace the question mark (?) with the appropriate affordance of the given action C, following the "A : B" relation. Your answer should be a single object without further explanation.
question:
shoot : gun. elect : ?
answer:
president


question:
send : text. wield : ?
answer:
sword


question:
write : letter. stalk : ?
answer:

prey