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Whitaker , whose army officer father had left his native Missouri for Germany four years earlier , had formed Shady Grove , with fellow US expatriate , keyboardist David Bach , while Kennell had just been drafted and was stationed there , beginning a two-year stint in the army .
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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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