\def\:tempc#1{\HCode{\kern18mu
{\string\rm\space mod}\string\,\string\,}#1}
\HLet\mod=\:tempc
\def\:tempc#1{\HCode{\kern18mu }(#1)}
\HLet\pod=\:tempc
\def\:tempc#1{\HCode{\kern18mu
\string\mathbin{\string\rm\space mod}\string\,\string\,}#1}
\HLet\bmod\:tempc
\def\:tempc#1{\HCode{\kern18mu }(\HCode{{\string\rm\space mod}\kern6mu\space} #1)}
\HLet\pmod=\:tempc
-_-_-