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Constraint propagation is one of the key techniques in constraint programming , and a large body of work has built up around it .
 part of: Constraint propagation, constraint programming
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:  Constraint propagation, constraint programming 
Answer:
 part of: Constraint propagation, constraint programming