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Natural cellular materials span the range of parameter space used in design , from beam or strut-based materials to surface based ones , including structures that combine both types , as shown in 13 .
 material: cellular materials; process parameter: range; concept or principle: parameter; engineering feature: design; machine or equipment: beam; engineering feature: strut-based; concept or principle: materials; concept or principle: surface; 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:
 material: cellular materials; process parameter: range; concept or principle: parameter; engineering feature: design; machine or equipment: beam; engineering feature: strut-based; concept or principle: materials; concept or principle: surface; material: as