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The L-PBF approach creates random pores by a reduced volume energy density .
 manufacturing process: L-PBF; machanical property: pores; concept or principle: volume; process parameter: energy density
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: L-PBF, pores, volume, energy density 
Answer:
 manufacturing process: L-PBF; machanical property: pores; concept or principle: volume; process parameter: energy density