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The system combines an extended two-level morphology -LSB- Trost , 1991a ; Trost , 1991b -RSB- with a feature-based word grammar building on a hierarchical lexicon .
 two-level morphology, system; two-level morphology, feature-based word grammar; hierarchical lexicon, feature-based word grammar
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:
 two-level morphology, system; two-level morphology, feature-based word grammar; hierarchical lexicon, feature-based word grammar