9,9,\u0039\u002C (C99)\U000039\U00002C (C99)\x39\x2C (encoding-dependent)\071\054 (encoding-dependent)\u{39}\u{2C} (C++23)\x{39}\x{2C} (C++23, encoding-dependent)\o{071}\o{054} (C++23, encoding-dependent)\U00000039\U0000002C\u0039\u002C\x39\x2C (encoding-dependent)\071\054 (encoding-dependent)\u0039\u002C\u{39}\u{2C}\u0039\u002C\x39\x2C\39\2C\000039\00002C=39=2C%39%2C