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After pyrolysis , it was found that truss designs exhibited different shrinkages at the beam element scale despite being composed of the same preceramic polymer and exhibiting isotropic shrinkage at the macro-truss scale .
 manufacturing process: pyrolysis; machine or equipment: truss; engineering feature: designs; machine or equipment: beam; material: polymer; machanical property: isotropic
Given options, please tell me the categories of all the listed entity words.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} 
 Entities: pyrolysis, truss, designs, beam, polymer, isotropic 
Answer:
 manufacturing process: pyrolysis; machine or equipment: truss; engineering feature: designs; machine or equipment: beam; material: polymer; machanical property: isotropic