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According to the San Jose Mercury News , " Bloom 's secret technology apparently lies in the proprietary green ink that acts as the anode and the black ink that acts as the cathode ... " but in fact these materials are widely known in the field of solid oxide fuel cell s ( SOFCs ) .
 San Jose Mercury News, Bloom
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 San Jose Mercury News, Bloom