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maybe the most significant difference is that we have changed from emigration out of necessity to emigration in search of new opportunities .
 cause effect: emigration, necessity
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: component whole, NA, instrument agency, member collection, cause effect, entity destination, content container, message topic, product producer, entity origin 
Text: {0} 
 Entity Pairs:  emigration, necessity 
Answer:
 cause effect: emigration, necessity