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During late-2013 through early-2014 NIST coordinated a special i-vector challenge based on data used in previous NIST Speaker Recognition Evaluations -LRB- SREs -RRB- .
 NIST Speaker Recognition Evaluations -LRB- SREs -RRB-, i-vector challenge
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:
 NIST Speaker Recognition Evaluations -LRB- SREs -RRB-, i-vector challenge