2070
In relation to the additive manufacturing challenges , three subsets of AM features for internal transport of media can be identified ; macro channel geometry , mini/micro channels and printed permeability .
 manufacturing process: additive manufacturing; manufacturing process: AM; process characterization: transport; material: be; engineering feature: macro channel geometry; concept or principle: mini/micro channels; machanical property: permeability
Please list all entity words in the text that fit the category.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} 
Answer:
 manufacturing process: additive manufacturing; manufacturing process: AM; process characterization: transport; material: be; engineering feature: macro channel geometry; concept or principle: mini/micro channels; machanical property: permeability