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This study presents the conditions for a higher deposition rate for various process parameters with defocused beams to eliminate the void defects due to keyholing formed in the melt pool .
 process parameter: deposition rate; concept or principle: process parameters; concept or principle: void defects; material: melt pool
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: deposition rate, process parameters, void defects, melt pool 
Answer:
 process parameter: deposition rate; concept or principle: process parameters; concept or principle: void defects; material: melt pool