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In applied mathematics , a nonlinear complementarity problem ( NCP ) with respect to a mapping ƒ : Rn → Rn , denoted by NCPƒ , is to find a vector x ∈ Rn such that where ƒ ( x ) is a smooth mapping .
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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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