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In directed energy deposition , material is injected into a melt pool that is traversed to fill in a crosB-section of a part , building it layer-by-layer .
 manufacturing process: directed energy deposition; material: material; material: melt pool; concept or principle: layer-by-layer
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: directed energy deposition, material, melt pool, layer-by-layer 
Answer:
 manufacturing process: directed energy deposition; material: material; material: melt pool; concept or principle: layer-by-layer