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#pragma once
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int isalnum(int c);
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int isalpha(int c);
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int isblank(int c);
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int iscntrl(int c);
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int isdigit(int c);
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int isgraph(int c);
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int islower(int c);
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int isprint(int c);
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int ispunct(int c);
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int isspace(int c);
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int isupper(int c);
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int isxdigit(int c);
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int tolower(int c);
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int toupper(int c);