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In 1930 , Wolfgang Pauli theorized that an undetected particle was carrying away the observed difference between the energy , momentum , and angular momentum of the initial and final particles .
 person: Wolfgang Pauli
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
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Text: {0} 
Answer:
 person: Wolfgang Pauli