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Hardness map results showed heterogeneous micro-hardness on the xy- and xz-planes of the aB-built parts where the bottom plane and center regions had larger hardness of ∼315 HV0.5 while the top plane and contours showed hardness of ∼300 HV0.5 .
 machanical property: Hardness; concept or principle: heterogeneous; machanical property: hardness; engineering feature: contours; machanical property: hardness
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: Hardness, heterogeneous, hardness, contours, hardness 
Answer:
 machanical property: Hardness; concept or principle: heterogeneous; machanical property: hardness; engineering feature: contours; machanical property: hardness