5598
Scanning electron microscopy observation was conducted on the fractured surfaces and showed that the samples underwent transgranular crack initiation , followed by intergranular crack growth and final failure .
 process characterization: Scanning electron microscopy; concept or principle: surfaces; concept or principle: samples; concept or principle: crack growth; concept or principle: failure
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: Scanning electron microscopy, surfaces, samples, crack growth, failure 
Answer:
 process characterization: Scanning electron microscopy; concept or principle: surfaces; concept or principle: samples; concept or principle: crack growth; concept or principle: failure