1984
This quality refers in particular to material density and process induced pores , inherent process surface roughness , build errors such as uneven powder spreading or scan track errors leading to critical flaws , residual stresses and associated warping and cracking and microstructural inhomogeneity .
 concept or principle: quality; material: material; machanical property: density; concept or principle: process; machanical property: pores; concept or principle: process; machanical property: roughness; process parameter: build; material: as; material: powder; concept or principle: errors; concept or principle: flaws; machanical property: residual stresses; concept or principle: warping; concept or principle: cracking; concept or principle: microstructural
Please list all entity words in the text that fit the category.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} 
Answer:
 concept or principle: quality; material: material; machanical property: density; concept or principle: process; machanical property: pores; concept or principle: process; machanical property: roughness; process parameter: build; material: as; material: powder; concept or principle: errors; concept or principle: flaws; machanical property: residual stresses; concept or principle: warping; concept or principle: cracking; concept or principle: microstructural