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Using laser diffraction , BET nitrogen adsorption , scanning electron microscopy imaging , and a microhydrodynamic analysis of milling , this study , for the first time , provides sufficient evidence for the existence of the Rehbinder effect during the milling of drugs .
 Chemical: nitrogen
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: nitrogen