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program that uses the facility, other than as an argument passed when the facility is invoked, then you must
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(For example, a function in a library to compute square roots has a purpose that is entirely well-defined
independent of the application. Therefore, Subsection 2d requires that any application-supplied 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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