1796
Many applications require structures composed of layers of heterogeneous materials and prefabricated components embedded between the layers .
 concept or principle: heterogeneous; machine or equipment: components
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: heterogeneous, components 
Answer:
 concept or principle: heterogeneous; machine or equipment: components