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The technique used in our research – “ MetalJet ” - is discussed by studying the ejection and the deposition of two example metals , tin and silver .
 concept or principle: research; concept or principle: ejection; concept or principle: deposition; material: metals; material: tin; material: silver
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: research, ejection, deposition, metals, tin, silver 
Answer:
 concept or principle: research; concept or principle: ejection; concept or principle: deposition; material: metals; material: tin; material: silver