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    it depends... on what? I want to learn what the reasons are behind that generic concept to know when to apply it and when not. Commented Nov 13, 2013 at 21:34
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    Hi Customer, please give me your id so I can help you. Sure, its gfds789gxb3456bgfx789fgh98076hytd6734nhg5678nghf875nhgf456. Hmm, how about your social? ... surrogate id Commented Nov 13, 2013 at 22:52
  • @Michael, Answer updated. Is that a familiar, simple and stable key? Commented Nov 14, 2013 at 4:28