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Fu and Lauke used two probability density functions for modelling the fiber length and fiber orientation distributions with the intention of predicting the elastic properties .
 concept or principle: probability density functions; enabling technology: modelling; concept or principle: fiber length; engineering feature: fiber orientation; concept or principle: distributions; machanical property: elastic
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: probability density functions; enabling technology: modelling; concept or principle: fiber length; engineering feature: fiber orientation; concept or principle: distributions; machanical property: elastic