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This work experimentally investigates how the severity of density and unit cell size grading as well as the building direction affects the stiffness , energy absorption and structural response of additively manufactured ( AM ) short fibre-reinforced lattices with same relative density .
 concept or principle: investigates; machanical property: density; concept or principle: unit cell; material: as; material: as; process parameter: building direction; machanical property: stiffness; process characterization: energy absorption; manufacturing process: additively manufactured; manufacturing process: AM; concept or principle: lattices; machanical property: relative density
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: investigates, density, unit cell, as, as, building direction, stiffness, energy absorption, additively manufactured, AM, lattices, relative density 
Answer:
 concept or principle: investigates; machanical property: density; concept or principle: unit cell; material: as; material: as; process parameter: building direction; machanical property: stiffness; process characterization: energy absorption; manufacturing process: additively manufactured; manufacturing process: AM; concept or principle: lattices; machanical property: relative density