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 for debugging
From The Free On-line Dictionary of Computing (30 December 2018) :

      The process of attempting to determine the cause of
     the symptoms of malfunctions in a program or other system.  These
     symptoms may be detected during testing or use by real users.
     Symptoms are often caused by factors outside the program, such as
     misconfiguration of the user's operating system,
     misunderstanding by the user (see PEBCAK) or failures in other
     external systems on which the program relies.  Some of these are
     more in the realm of technical support but need to be
     eliminated.  Debugging really starts when it has been established
     that the program is not behaving according to its specification
     (which may be formal or informal).  It can be done by visual
     inspection of the source code, debugging by printf or using a
     debugger.  The result may be that the program is actually
     behaving as specified but that the spec is wrong or the
     requirements on which it was based were deficient in some way (see
     Once a bug has been identified and a fix applied, the program must
     be tested to determine whether the bug is really fixed and what
     effects the changes have had on other aspects of the program's
     operation (see regression testing).
     The term is said to have been coined by Grace Hopper, based on
     the term "{bug".

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