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This abstract describes a natural language system which deals usefully with ungrammatical input and describes some actual and potential applications of it in computer aided second language learning .
 used for: natural language system, ungrammatical input; used for: it, computer aided second language learning
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 system, ungrammatical input; it, computer aided second language learning 
Answer:
 used for: natural language system, ungrammatical input; used for: it, computer aided second language learning