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d) If a facility in the modified Library refers to a function or a table
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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 applica-
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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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To do this, you must alter all the notices that refer to this License,
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