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The unique design flexibility of AM has enabled the fabrication of a functionally graded lattice ( FGL ) by gradually changing the lattice size and enhancing structural efficiency of lattice structures .
 concept or principle: design flexibility; manufacturing process: AM; manufacturing process: fabrication; engineering feature: functionally graded lattice; concept or principle: lattice; engineering feature: lattice structures
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: design flexibility, AM, fabrication, functionally graded lattice, lattice, lattice structures 
Answer:
 concept or principle: design flexibility; manufacturing process: AM; manufacturing process: fabrication; engineering feature: functionally graded lattice; concept or principle: lattice; engineering feature: lattice structures