3737\u0033\u0037 (C99)\U000033\U000037 (C99)\x33\x37 (encoding-dependent)\063\067 (encoding-dependent)\u{33}\u{37} (C++23)\x{33}\x{37} (C++23, encoding-dependent)\o{063}\o{067} (C++23, encoding-dependent)\U00000033\U00000037\u0033\u0037\x33\x37 (encoding-dependent)\063\067 (encoding-dependent)\u0033\u0037\u{33}\u{37}\u0033\u0037\x33\x37\33\37\000033\000037=33=37%33%37