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Italians from the Corpo Truppe Volontarie served in these mixed Italo-Spanish Flechas ( Arrows ) units where the Italians provided the officers and technical personnel , while the Spanish served in the rank-and-file .
 Corpo Truppe Volontarie, Flechas
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Corpo Truppe Volontarie, Flechas