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For grains with complex morphologies , K-means clustering in orientation space is demonstrated as a useful approach for determining the initial growth orientation .
 concept or principle: grains; concept or principle: complex morphologies; concept or principle: orientation; material: as; concept or principle: orientation
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: grains; concept or principle: complex morphologies; concept or principle: orientation; material: as; concept or principle: orientation