4796
The uniformity of the powder bed is affected causing defects such as porosity , delamination , warping and lack of fusion .
 machine or equipment: powder bed; concept or principle: defects; material: as; concept or principle: delamination; concept or principle: warping; concept or principle: fusion
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: powder bed, defects, as, delamination, warping, fusion 
Answer:
 machine or equipment: powder bed; concept or principle: defects; material: as; concept or principle: delamination; concept or principle: warping; concept or principle: fusion