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The design bore such a strong resemblance to the contemporary Sikorsky Ilya Muromets bombers produced in Russia that Jane 's Encyclopedia of Aviation describes it as " virtually a copy " of that aircraft , and in their book on German multi-engine types of World War I , Haddow and Grosz comment that designer Villehad Forssman " was content to copy the Sikorsky configuration almost line-for-line " .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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