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Currently , the main lithium resource is brine lakes , but the conventional lithium recovery process is time consuming , inefficient , and environmentally harmful .
 Chemical: lithium; Chemical: lithium
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: lithium, lithium 
Answer:
 Chemical: lithium; Chemical: lithium