38989
Nickel carbonyl decomposes readily back to Ni and CO upon contact with hot surfaces , and this method is used for the industrial purification of nickel in the Mond process .
 location: Ni; location: CO
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Ni, CO 
Answer:
 location: Ni; location: CO