Two analogies on manipulating items in a kitchen is given in the form "A : B. C : ?". The phrase "A : B" relates item A to its appropriate manipulation B. Your task is to replace the question mark (?) with the appropriate manipulation of item C, following the "A : B" relation. Your answer should be a verb which shows a way to manipulate the given object.

Example Input: safe : unlock. walnut : ?
Example Output: shell

Example Input: faucet : turn. box : ?
Example Output: open

Example Input: safe : unlock. letter : ?
Example Output:
open