[Groff] groff_char.7: can't find special character 'xx'

Hello, are there special characters missing in groff? I get the following warnings in an UTF8 locale: $ tbl /usr/local/share/man/man7/groff_char.7|nroff -mandoc >/dev/null /usr/local/share/man/man7/groff_char.7:811: warning: can't find special character `\o' /usr/local/share/man/man7/groff_cha

Re: [Groff] groff_char.7: can't find special character 'xx'

> groff_char.7:811: warning: can't find special character `\o' This was a typo, now fixed in git. > groff_char.7:1038: warning: can't find special character `bs' > groff_char.7:1179: warning: can't find special character `radicalex' > groff_char.7:1182: warning: can't find special character `sqr