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This was performed by monitoring the evolution of the molten pool size and geometry when building a wall structure .
 concept or principle: evolution; concept or principle: molten pool; concept or principle: geometry; concept or principle: structure
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: evolution, molten pool, geometry, structure 
Answer:
 concept or principle: evolution; concept or principle: molten pool; concept or principle: geometry; concept or principle: structure