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In this paper we introduce a modal language LT for imposing constraints on trees , and an extension LT -LRB- LF -RRB- for imposing constraints on trees decorated with feature structures .
 modal language LT, constraints on trees; extension LT -LRB- LF -RRB-, constraints on trees decorated with feature structures
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:
 modal language LT, constraints on trees; extension LT -LRB- LF -RRB-, constraints on trees decorated with feature structures