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= Product Serial Numbers =
 
= Product Serial Numbers =
Serial numbers are composed of at least [[#Prefix|three letters]] followed by ten decimal digits. The tenth digit is a [[#Check_Digit|check digit]], meaning that it is derived from the other digits.
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Serial numbers are composed of at least [[#Prefix|three letters]] followed by eleven decimal digits. The eleventh digit is a [[#Check_Digit|check digit]], meaning that it is derived from the other digits.
    
== Prefix ==
 
== Prefix ==

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