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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 facility, 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 facility 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 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.)

These requirements apply to the modified work as a whole. If

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