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: box : open. backpack : ?
Example Output: unzip

Example Input: letter : open. shoe : ?
Example Output: untie

Example Input: present : open. suitcase : ?
Example Output:
open