1mandoc: unsupp.in:7:20: UNSUPP: unsupported escape sequence: \! 2mandoc: unsupp.in:7:23: ERROR: invalid special character: \[!] 3mandoc: unsupp.in:8:17: UNSUPP: unsupported escape sequence: \? 4mandoc: unsupp.in:8:21: UNSUPP: unsupported escape sequence: \? 5mandoc: unsupp.in:8:24: ERROR: invalid special character: \[?] 6