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The PDTB is being built directly on top of the Penn TreeBank and Propbank , thus supporting the extraction of useful syntactic and semantic features and providing a richer substrate for the development and evaluation of practical algorithms .
 PDTB, extraction of useful syntactic and semantic features; PDTB, practical algorithms; Penn TreeBank, PDTB; Penn TreeBank, Propbank; Propbank, PDTB
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:
 PDTB, extraction of useful syntactic and semantic features; PDTB, practical algorithms; Penn TreeBank, PDTB; Penn TreeBank, Propbank; Propbank, PDTB