1090
Parts that were initially sintered in air and then annealed in a hydrogen atmosphere led to higher porosity compared to those sintered in hydrogen alone .
 manufacturing process: sintered; application: led; machanical property: porosity; manufacturing process: sintered
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: sintered, led, porosity, sintered 
Answer:
 manufacturing process: sintered; application: led; machanical property: porosity; manufacturing process: sintered