1506
This paper proposes a feasible end-to-end approach to this challenging problem .
 used for: end-to-end approach, problem
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: conjunction, feature of, hyponym of, used for, part of, compare, evaluate for 
Text: {0} 
 Entity Pairs:  end-to-end approach, problem 
Answer:
 used for: end-to-end approach, problem