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Although the majority of TiO2 applications are known to exist in the pigment - grade form , nanoscale forms of TiO2 are also common components in several products .
 Chemical: TiO2; Chemical: TiO2
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: TiO2, TiO2 
Answer:
 Chemical: TiO2; Chemical: TiO2