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To make the annotation less subjective and more reliable , recent studies employ crowdsourcing tools to collect pairwise comparisons -- relying on majority voting to prune the annotation outliers/errors .
 used for: crowdsourcing tools, pairwise comparisons; used for: majority voting, crowdsourcing tools; used for: majority voting, annotation outliers/errors
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:  crowdsourcing tools, pairwise comparisons; majority voting, crowdsourcing tools; majority voting, annotation outliers/errors 
Answer:
 used for: crowdsourcing tools, pairwise comparisons; used for: majority voting, crowdsourcing tools; used for: majority voting, annotation outliers/errors