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Following the perhaps unavoidable development of the first focal seizures ( " epileptogenesis " ) , the most fruitful therapeutic strategy may be to interrupt the process of " epileptic maturation , " thereby keeping focal seizures focal .
 None
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:
 None