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While keyhole pores , lack of fusion pores and metallurgical pores have been previously identified and illustrated using X-ray tomography , this work extends beyond prior work to show how each of these not only exist in extreme situations but how they vary in size and shape in the transition regimes .
 machanical property: pores; concept or principle: fusion; application: metallurgical; process characterization: X-ray tomography; concept or principle: transition
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: pores, fusion, metallurgical, X-ray tomography, transition 
Answer:
 machanical property: pores; concept or principle: fusion; application: metallurgical; process characterization: X-ray tomography; concept or principle: transition