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Optimisation of the laser parameters and scan strategies was found to also increase the fatigue strength for a given stiffness of porous AM materials by 7–8 % .
 enabling technology: laser; machanical property: fatigue strength; machanical property: stiffness; machanical property: porous; material: AM materials
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: laser, fatigue strength, stiffness, porous, AM materials 
Answer:
 enabling technology: laser; machanical property: fatigue strength; machanical property: stiffness; machanical property: porous; material: AM materials