871
Lightweight cellular carbon fiber and SiC whiskers filled composites have been demonstrated by applying 3D extrusion printing method , as described in 16 .
 concept or principle: Lightweight; process characterization: cellular carbon fiber; material: SiC whiskers; material: composites; concept or principle: 3D; material: as
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: Lightweight; process characterization: cellular carbon fiber; material: SiC whiskers; material: composites; concept or principle: 3D; material: as