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libc { GLIBC_2.0 { # global variables __ctype_b; __ctype_tolower; __ctype_toupper; # i* isalnum; isalpha; isascii; isblank; iscntrl; isdigit; isgraph; islower; isprint; ispunct; isspace; isupper; isxdigit; # t* toascii; tolower; toupper; } }