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A Green 's function approach is used to decouple the solution at each time step into the analytical source contribution and a conduction contribution .
 concept or principle: solution; concept or principle: step; application: source
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
 Entities: solution, step, source 
Answer:
 concept or principle: solution; concept or principle: step; application: source