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The eruption was one of the largest of the 20th century , only slightly less in magnitude to that of Mount Pinatubo in 1991 .
 location: Mount Pinatubo
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 location: Mount Pinatubo