mandoc: O1.in:11:6: WARNING: invalid escape sequence: \O5 mandoc: O1.in:12:7: WARNING: invalid escape sequence: \O(52 mandoc: O1.in:13:7: UNSUPP: unsupported escape sequence: \O[5dummy] mandoc: O1.in:14:6: WARNING: invalid escape sequence: \O6 mandoc: O1.in:15:6: UNSUPP: unsupported escape sequence: \O0