8408
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 .
 used for: PDTB, extraction of useful syntactic and semantic features; evaluate for: PDTB, practical algorithms; used for: Penn TreeBank, PDTB; conjunction: Penn TreeBank, Propbank; used for: Propbank, PDTB
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:  PDTB, extraction of useful syntactic and semantic features; PDTB, practical algorithms; Penn TreeBank, PDTB; Penn TreeBank, Propbank; Propbank, PDTB 
Answer:
 used for: PDTB, extraction of useful syntactic and semantic features; evaluate for: PDTB, practical algorithms; used for: Penn TreeBank, PDTB; conjunction: Penn TreeBank, Propbank; used for: Propbank, PDTB