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His funeral was held two days later , with hundreds in attendance , including fellow composer Pietro Mascagni and longtime rival Giacomo Puccini .
 Pietro Mascagni, Giacomo Puccini
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Pietro Mascagni, Giacomo Puccini