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Geoffroy traveled to Martinique and French Guiana in search of latex-yielding trees , but also studied the region 's native plants in the genus Robinia after learning that forest Indians of French Guiana used Robinia as fish poisons .
 Geoffroy, Martinique, French Guiana, Guiana
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Geoffroy, Martinique, French Guiana, Guiana