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The objective is a generic system of tools , including a core English lexicon , grammar , and concept representations , for building natural language processing -LRB- NLP -RRB- systems for text understanding .
 system, natural language processing -LRB- NLP -RRB- systems; core English lexicon, system; grammar, system; concept representations, system; natural language processing -LRB- NLP -RRB- systems, text understanding
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: conjunction, feature of, hyponym of, used for, part of, compare, evaluate for 
Text: {0} 
Answer:
 system, natural language processing -LRB- NLP -RRB- systems; core English lexicon, system; grammar, system; concept representations, system; natural language processing -LRB- NLP -RRB- systems, text understanding