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The microstructure of each layer except the top layer consists of vertical columnar dendrites and direction-changed columnar dendrites in sequence .
 concept or principle: microstructure; process parameter: layer; process parameter: layer; concept or principle: vertical; material: columnar dendrites; material: columnar dendrites
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: microstructure; process parameter: layer; process parameter: layer; concept or principle: vertical; material: columnar dendrites; material: columnar dendrites