cccc\u0063\u0063 (C99)\U000063\U000063 (C99)\x63\x63 (encoding-dependent)\143\143 (encoding-dependent)\u{63}\u{63} (C++23)\x{63}\x{63} (C++23, encoding-dependent)\o{143}\o{143} (C++23, encoding-dependent)\U00000063\U00000063\u0063\u0063\x63\x63 (encoding-dependent)\143\143 (encoding-dependent)\u0063\u0063\u{63}\u{63}\u0063\u0063\x63\x63\63\63\000063\000063=63=63%63%63