27370
This so called " excess drain current noise " is the outcome of local fluctuations of the Fermi level , resulting from stochastic exchange of electrons between traps near the Fermi level .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
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