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