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// generate 36 length UUID
// from: http://stackoverflow.com/questions/8684551/generate-a-uuid-string-with-arc-enabled
+ (NSString *)uuidString {
    // Returns a UUID
  
    CFUUIDRef uuid = CFUUIDCreate(kCFAllocatorDefault);
    NSString *uuidStr = (__bridge_transfer NSString *)CFUUIDCreateString(kCFAllocatorDefault, uuid);
    CFRelease(uuid);
	
    return uuidStr;
}