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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 .
 used for: modal language LT, constraints on trees; used for: extension LT -LRB- LF -RRB-, constraints on trees decorated with feature structures
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:  modal language LT, constraints on trees; extension LT -LRB- LF -RRB-, constraints on trees decorated with feature structures 
Answer:
 used for: modal language LT, constraints on trees; used for: extension LT -LRB- LF -RRB-, constraints on trees decorated with feature structures