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We tested the clustering and filtering processes on electronic newsgroup discussions , and evaluated their performance by means of two experiments : coarse-level clustering simple information retrieval .
 electronic newsgroup discussions, clustering and filtering processes; experiments, clustering and filtering processes; experiments, clustering and filtering processes; coarse-level clustering, experiments; information retrieval, experiments
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:
 electronic newsgroup discussions, clustering and filtering processes; experiments, clustering and filtering processes; experiments, clustering and filtering processes; coarse-level clustering, experiments; information retrieval, experiments