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Thus the work reported addresses two robustness problems faced by current experimental natural language processing systems : coping with an incomplete lexicon and with incomplete knowledge of phrasal constructions .
 feature of: robustness problems, natural language processing systems; hyponym of: incomplete lexicon, robustness problems; hyponym of: incomplete knowledge of phrasal constructions, robustness problems
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: conjunction, feature of, hyponym of, used for, part of, compare, evaluate for 
Text: {0} 
Answer:
 feature of: robustness problems, natural language processing systems; hyponym of: incomplete lexicon, robustness problems; hyponym of: incomplete knowledge of phrasal constructions, robustness problems