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This linkage of ex-situ and in-situ morphology enabled the use of supervised Machine Learning to classify melt pools observed ( with the high speed camera ) during fusion of non-bulk geometries such as overhangs .
 in-situ, Machine, melt pools, camera, fusion, geometries, as
Please list all entity words in the text that fit the category. Output format is "word1, 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} 
Answer:
 in-situ, Machine, melt pools, camera, fusion, geometries, as