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Stone married his first wife Victoria Heitmueller of Göttingen in 1889 and they had two children , David Frederick Stone ( 1890 – 1987 ) and Richard Stone .
 Stone, Göttingen, Stone, Stone
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Stone, Göttingen, Stone, Stone