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The Olmec heartland is the area in the Gulf lowlands where it expanded after early development in Soconusco , Veracruz .
 Olmec, Gulf, Soconusco, Veracruz
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Olmec, Gulf, Soconusco, Veracruz