1854
Humans have been using cellular materials such as wood , cork and bamboo , several millennia before we realized the underlying structural basis for their interesting behaviour .
 material: cellular materials; material: as; material: cork
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; material: as; material: cork