179767
Plot Its plot concerns an American sailor who voyages to search for diamonds on a volcanic island but has to contend with mysteries , pirates and an exploding volcano based on the 1883 eruption on the island of Krakatoa .
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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:
 None