9480
It is thus difficult to understand , improve , and accelerate them in a coherent framework .
 used for: coherent framework, them
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:  coherent framework, them 
Answer:
 used for: coherent framework, them