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Middleton ( 1990 ) suggests that both modal and fourth-oriented structures , rather than being , " distortions or surface transformations of Schenker 's favoured V-I kernel , are more likely branches of a deeper principle , that of tonic/not-tonic differentiation . "
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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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