306568
It is commonly used in conjunction with EN 1522 ( Euronorm standard for Bullet Resistance in Windows , Doors , Shutters and Blinds ) to form a ballistic classification system by which armored vehicles and structures are tested and rated .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None