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The worst-case scenario for an eruption is a large pyroclastic flow , similar to that which occurred in the 1980 eruption of Mount St. Helens .
 Mount St. Helens
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Mount St. Helens