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d) If a facility in the modied Library refers to a function or a table of data to be supplied by an application
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(For example, a function in a library to compute square roots has a purpose that is entirely well-dened
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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