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The results showed an interesting similarity between hardness and density which is highly related to the formation of the melting pool and porosities within the process .
 machanical property: hardness; machanical property: density; manufacturing process: melting; machanical property: porosities; concept or principle: process
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, density, melting, porosities, process 
Answer:
 machanical property: hardness; machanical property: density; manufacturing process: melting; machanical property: porosities; concept or principle: process