846
Fracture analysis of fatigued samples reveals that the near-surface pores lead to the crack initiation in both SLM and FSW cases .
 concept or principle: Fracture; concept or principle: samples; machanical property: pores; material: lead; manufacturing process: SLM; manufacturing process: FSW
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:
 concept or principle: Fracture; concept or principle: samples; machanical property: pores; material: lead; manufacturing process: SLM; manufacturing process: FSW