Follow-up Comment #8, bug #68136 (group groff): If gropdf ever requires perl 5.14 (which introduced the /r modifier), the outer block and second variable can both go away.
sub SubTag
{
state $subtag_counter = 0;
return(sprintf ("%06X+", $subtag_counter++)) =~ tr/0-9/Q-Z/r;
}
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