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The 1730 definition of the word " chemistry " , as used by Georg Ernst Stahl , meant the art of resolving mixed , compound , or aggregate bodies into their principles ; and of composing such bodies from those principles .
 Georg Ernst Stahl
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Text: {0} 
Answer:
 Georg Ernst Stahl