16596
This mechanism is characterized by the exponential distance dependence of the arrival rate on the donor / acceptor distance , k ( a ) ~ e ( - beta R ) , with beta = 0 . 9 A ( - 1 ) .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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