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In this study , we tested the tensile structural strength of support structures with four different 2-dimensional lattice geometries by fabricating samples composed of solid material on the bottom , followed by support material in the middle , followed by solid material on the top .
 tensile, strength, support structures, lattice geometries, fabricating, material, support material, material
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:
 tensile, strength, support structures, lattice geometries, fabricating, material, support material, material