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Much of the band 's songwriting material in this era also came from the members ' own experiences traveling through the country in near-constant tours over the previous several years , as well as an increasing sense of political activism which would find expression on subsequent albums " Lifes Rich Pageant " and " Document " .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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