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This combination formed a Bingham plastic that could be extruded using a readily available direct-ink write printer .
 material: plastic; material: be; machine or equipment: printer
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: plastic, be, printer 
Answer:
 material: plastic; material: be; machine or equipment: printer