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Cutting forces within the MMC region are found to increase by as much as 40 % which has been subsequently related to the periodic changes in microstructure generated by the layer by layer build strategy .
 concept or principle: Cutting forces; material: MMC; material: as; material: as; concept or principle: microstructure; concept or principle: layer by layer; concept or principle: build strategy
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: Cutting forces, MMC, as, as, microstructure, layer by layer, build strategy 
Answer:
 concept or principle: Cutting forces; material: MMC; material: as; material: as; concept or principle: microstructure; concept or principle: layer by layer; concept or principle: build strategy