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Samples were fabricated using an Arcam A2 electron beam melting ( EBM ) machine and evaluated for geometric deviation from the original CAD design using a digital optical microscope .
 concept or principle: Samples; concept or principle: fabricated; manufacturing process: electron beam melting; manufacturing process: EBM; machine or equipment: machine; enabling technology: CAD; process characterization: optical; machine or equipment: microscope
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: Samples, fabricated, electron beam melting, EBM, machine, CAD, optical, microscope 
Answer:
 concept or principle: Samples; concept or principle: fabricated; manufacturing process: electron beam melting; manufacturing process: EBM; machine or equipment: machine; enabling technology: CAD; process characterization: optical; machine or equipment: microscope