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#include	<ctype.h>
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int
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toupper(int c)
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{
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	if(c < 'a' || c > 'z')
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		return c;
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	return _toupper(c);
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}
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int
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tolower(int c)
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{
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	if(c < 'A' || c > 'Z')
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		return c;
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	return _tolower(c);
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}