1485
These dislocation can act as preferential sites for atomic hydrogen absorption and as well as for the hydrogen , allowing to diffuse to the surface .
 concept or principle: dislocation; material: as; concept or principle: atomic hydrogen absorption; material: as; material: as; concept or principle: surface
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: dislocation; material: as; concept or principle: atomic hydrogen absorption; material: as; material: as; concept or principle: surface