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The main goal of this work is the adoption of additive manufacturing for the production of inexpensive rare-earth free MnAl-based permanent magnets .
 manufacturing process: additive manufacturing; manufacturing process: production; material: permanent magnets
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: additive manufacturing, production, permanent magnets 
Answer:
 manufacturing process: additive manufacturing; manufacturing process: production; material: permanent magnets