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/* Compare strings S1 and S2, ignoring case, returning less than, equal to or
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greater than zero if S1 is lexicographically less than, equal to or greater
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/* Compare no more than N characters of strings S1 and S2, ignoring case,
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returning less than, equal to or greater than zero if S1 is
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lexicographically less than, equal to or greater than S2. */