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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 .
 investigates, density, unit cell, as, as, building direction, stiffness, energy absorption, additively manufactured, AM, lattices, relative density
Please list all entity words in the text that fit the category. Output format is "word1, 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:
 investigates, density, unit cell, as, as, building direction, stiffness, energy absorption, additively manufactured, AM, lattices, relative density