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The use of BLEU at the character level eliminates the word segmentation problem : it makes it possible to directly compare commercial systems outputting unsegmented texts with , for instance , statistical MT systems which usually segment their outputs .
 BLEU, character level; BLEU, word segmentation problem; it, commercial systems; it, statistical MT systems; commercial systems, statistical MT systems
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:
 BLEU, character level; BLEU, word segmentation problem; it, commercial systems; it, statistical MT systems; commercial systems, statistical MT systems