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In computer programming an input kludge is software that fails to handle simple user input. For example, if a computer program accepts free text input from the user, an ad hoc algorithm will mishandle many combinations of legal and illegal input strings. Input kludge is usually difficult for a programmer to detect in a unit test, but very easy for the end user to find. The evidence exists that the end user can easily crash software that fails to correctly handle user input, indeed the buffer overflow security hole is an example of the problems caused.