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Instead , a technique combining 3D printing and gravity casting was shown to be effective in producing topologically-ordered porous Mg structures , where a porous NaCl mould was created using SLM and then Mg alloy was cast into the mould .
 manufacturing process: 3D printing; manufacturing process: casting; material: be; machanical property: porous; material: Mg; machanical property: porous; material: NaCl; machine or equipment: mould; manufacturing process: SLM; material: Mg alloy; manufacturing process: cast; machine or equipment: mould
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:
 manufacturing process: 3D printing; manufacturing process: casting; material: be; machanical property: porous; material: Mg; machanical property: porous; material: NaCl; machine or equipment: mould; manufacturing process: SLM; material: Mg alloy; manufacturing process: cast; machine or equipment: mould