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We argue in favor of the the use of labeled directed graph to represent various types of linguistic structures , and illustrate how this allows one to view NLP tasks as graph transformations .
 used for: labeled directed graph, linguistic structures; used for: labeled directed graph, NLP tasks; used for: this, NLP tasks
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:  labeled directed graph, linguistic structures; labeled directed graph, NLP tasks; this, NLP tasks 
Answer:
 used for: labeled directed graph, linguistic structures; used for: labeled directed graph, NLP tasks; used for: this, NLP tasks