2121\u0032\u0031 (C99)\U000032\U000031 (C99)\x32\x31 (encoding-dependent)\062\061 (encoding-dependent)\u{32}\u{31} (C++23)\x{32}\x{31} (C++23, encoding-dependent)\o{062}\o{061} (C++23, encoding-dependent)\U00000032\U00000031\u0032\u0031\x32\x31 (encoding-dependent)\062\061 (encoding-dependent)\u0032\u0031\u{32}\u{31}\u0032\u0031\x32\x31\32\31\000032\000031=32=31%32%31