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Thus , in this paper , we study the problem of robust PCA with side information , where both prior structure and features of entities are exploited for recovery .
 used for: side information, robust PCA; conjunction: prior structure, features of entities; used for: prior structure, recovery; used for: features of entities, recovery
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: conjunction, feature of, hyponym of, used for, part of, compare, evaluate for 
Text: {0} 
Answer:
 used for: side information, robust PCA; conjunction: prior structure, features of entities; used for: prior structure, recovery; used for: features of entities, recovery