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Settlers are fictional human colonists that replaced the earlier Spacer emigrants who were in dominance in the vague period between Isaac Asimov 's Robot series near-future short stories ( of the type collected in I , Robot ) and novels .
 Isaac Asimov
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Isaac Asimov