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Using natural language processing , we carried out a trend survey on Japanese natural language processing studies that have been done over the last ten years .
 used for: natural language processing, trend survey on Japanese natural language processing studies
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:  natural language processing, trend survey on Japanese natural language processing studies 
Answer:
 used for: natural language processing, trend survey on Japanese natural language processing studies