1455
Biodegradation decreased the fatigue strength of the porous material from 30 % to 20 % of its yield strength .
 machanical property: fatigue strength; material: porous material; machanical property: yield strength
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: fatigue strength, porous material, yield strength 
Answer:
 machanical property: fatigue strength; material: porous material; machanical property: yield strength