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