-(NSString*) uuid {
CFUUIDRef puuid = CFUUIDCreate( nil );
CFStringRef uuidString = CFUUIDCreateString( nil, puuid );
NSString * result = (NSString *)CFBridgingRelease(CFStringCreateCopy( NULL, uuidString));
CFRelease(puuid);
CFRelease(uuidString);
return result ;
}
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