9708
A synchronous , concerted chemical process is rigorously divided by the reaction force F ( R ) , the negative gradient of V ( R ) , into " reactant " and " product " regions which are dominated by structural changes and an intervening " transition " region which is electronically intensive .
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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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