5401
this proves that the generator actually produced the renewable energy purchased and acts as the operative instrument of the transaction .
 cause effect: generator, energy
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:  generator, energy 
Answer:
 cause effect: generator, energy