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Sufficiently dense matter containing protons experiences proton degeneracy pressure , in a manner similar to the electron degeneracy pressure in electron-degenerate matter : protons confined to a sufficiently small volume have a large uncertainty in their momentum due to the Heisenberg uncertainty principle .
 person: Heisenberg
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Heisenberg