,,,\u002C (C99)\U00002C (C99)\x2C (encoding-dependent)\054 (encoding-dependent)\u{2C} (C++23)\x{2C} (C++23, encoding-dependent)\o{054} (C++23, encoding-dependent)\U0000002C\u002C\x2C (encoding-dependent)\054 (encoding-dependent)\u002C\u{2C}\u002C\x2C\2C\00002C=2C%2C