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In 1979 , he completed a second bachelor 's degree in Science , with a concentration in Pre-medicine , from the University of Puerto Rico at Mayagüez .
 University of Puerto Rico at Mayagüez
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 University of Puerto Rico at Mayagüez