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d) If a facility in the modified Library refers to a function or a table
of data to be supplied by an application program that uses the faci-
lity, other than as an argument passed when the facility is invoked,
then you must make a good faith effort to ensure that, in the event
an application does not supply such function or table, the facili-
ty still operates, and performs whatever part of its purpose remains
meaningful.
(For example, a function in a library to compute square roots has a
purpose that is entirely well-defined independent of the applica-
tion. Therefore, Subsection 2d requires that any application-sup-
plied function or table used by this function must be optional: if the
application does not supply it, the square root function must still
compute square roots.)
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