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''Dangerous implements'' - Users should not gain access to [[Library (computing)|libraries]], [[data structure]]s, or [[Pointer (computer programming)|pointers]] to data structures.<ref name="robust_programming" /> This information should be hidden from the user so that the user doesn't accidentally modify them and introduce a bug in the code. When such [[Interface (object-oriented programming)|interfaces]] are correctly built, users use them without finding loopholes to modify the interface. The interface should already be correctly implemented, so the user does not need to make modifications. The user therefore focuses solely on his or her own code.
''[[Assertion (software development)|Can't happen]]'' - Very often, code is modified and may introduce a possibility that an "impossible" case occurs. Impossible cases are therefore assumed to be highly unlikely instead.<ref name="robust_programming" /> The developer thinks about how to handle the case that is highly unlikely, and implements the handling accordingly.
=== Robust machine learning ===
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