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The South China Sea Islands , collectively comprising several archipelago clusters of mostly small uninhabited islands , islets ( cays and shoals ) , reefs / atolls and seamounts numbering in the hundreds , are subject to competing claims of sovereignty by several countries .
 South China Sea Islands
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 South China Sea Islands