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A scale-invariant description of melt pool morphology is constructed using Computer Vision techniques and unsupervised Machine Learning is used to differentiate between observed melt pools .
 material: melt pool; concept or principle: Computer Vision; machine or equipment: Machine; material: melt pools
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: melt pool, Computer Vision, Machine, melt pools 
Answer:
 material: melt pool; concept or principle: Computer Vision; machine or equipment: Machine; material: melt pools