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Instead of using the images , this paper takes the video data as the study subject to investigate the droplet evolution behavior in the inkjet printing process .
 concept or principle: images; concept or principle: data; material: as; concept or principle: droplet; manufacturing process: inkjet printing process
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: images, data, as, droplet, inkjet printing process 
Answer:
 concept or principle: images; concept or principle: data; material: as; concept or principle: droplet; manufacturing process: inkjet printing process