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The additive manufacturing processing parameters ( scan speed and hatch spacing ) were varied in order to have porosities varying from 0.1 % to 70 % so as to see the effects of processing parameters on the formation of pores and cracks .
 manufacturing process: additive manufacturing; concept or principle: parameters; process parameter: scan speed; process parameter: hatch spacing; machanical property: porosities; material: as; concept or principle: parameters; machanical property: pores
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: additive manufacturing, parameters, scan speed, hatch spacing, porosities, as, parameters, pores 
Answer:
 manufacturing process: additive manufacturing; concept or principle: parameters; process parameter: scan speed; process parameter: hatch spacing; machanical property: porosities; material: as; concept or principle: parameters; machanical property: pores