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Distinct boundaries can be removed through a heterogeneous compositional transition from a dispersed to an interconnected second phase structure , graded layers with discrete compositional parameters or smooth concentration gradients .
 engineering feature: boundaries; material: be; concept or principle: heterogeneous; concept or principle: transition; concept or principle: phase; concept or principle: parameters
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:
 engineering feature: boundaries; material: be; concept or principle: heterogeneous; concept or principle: transition; concept or principle: phase; concept or principle: parameters