2331
By building models of shape variation they enable search algorithms to use a pri-ori knowledge in an efficient and gainful way .
 used for: search algorithms, models of shape variation; used for: pri-ori knowledge, search algorithms
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: conjunction, feature of, hyponym of, used for, part of, compare, evaluate for 
Text: {0} 
Answer:
 used for: search algorithms, models of shape variation; used for: pri-ori knowledge, search algorithms