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By the spring of 1915 , the Russians had retreated from Galicia , and , in May , the Central Powers achieved a remarkable breakthrough on Poland 's southern frontiers with their Gorlice–Tarnów Offensive .
 Galicia, Central Powers, Poland
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Galicia, Central Powers, Poland