22220
The protocol involves controlling the tip - sample interaction regime during AM - AFM scanning , determining the tip - sample contact geometry , calculating the peak repulsive force and normal stress over the course of the wear test , and quantifying the wear volume using high - resolution transmission electron microscopy imaging .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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