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By using T3DP technology , it was possible to selectively deposit two different materials beside each other , offering the prospect of combining suspensions with different contents of a pore forming agents to obtained components with dense and porous areas inside .
 concept or principle: technology; concept or principle: materials; process parameter: pore forming agents; machine or equipment: components; engineering feature: dense and porous; process parameter: areas
Please list all entity words in the text that fit the category.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} 
Answer:
 concept or principle: technology; concept or principle: materials; process parameter: pore forming agents; machine or equipment: components; engineering feature: dense and porous; process parameter: areas