5963
The use of aluminium ( Al ) alloys in SLM is still quite limited due to difficulties in processing that result in parts with high degrees of porosity .
 material: aluminium; material: Al; material: alloys; manufacturing process: SLM; process characterization: degrees of porosity
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: aluminium, Al, alloys, SLM, degrees of porosity 
Answer:
 material: aluminium; material: Al; material: alloys; manufacturing process: SLM; process characterization: degrees of porosity