130603
Their level surfaces ( invariant submanifolds ) form a fibered manifold F : Z \ to N = F ( Z ) over a connected open subset N \ subset \ mathbb R ^ k. ( ii ) There exist smooth real functions s _ on N such that the Poisson bracket of integrals of motion reads \ = s _ \ circ F. ( iii ) The matrix function s _ is of constant corank m = 2n-k on N. If k = n , this is the case of a completely integrable Hamiltonian system .
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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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