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34 .Nd phonographic character test
40 .Fn isphonogram "int c"
43 .Fn isphonogram_l "int c" "locale_t locale"
49 functions test for a phonographic character.
51 The _l-suffixed version takes an explicit
54 non-suffixed version uses the current global or per-thread locale.
60 functions return zero if the character tests false and
61 returns non-zero if the character tests true.