24691
CO2 ice is one of the most abundant components in ice - coated interstellar ices besides H2O and CO , but the most favorable path to CO2 ice is still unclear .
 Chemical: CO2; Chemical: H2O; Chemical: CO; Chemical: CO2
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: CO2, H2O, CO, CO2 
Answer:
 Chemical: CO2; Chemical: H2O; Chemical: CO; Chemical: CO2