(Pointed out by Kazuhiro NISHIYAMA)
%# \e$B%a!<%j%s%0%j%9%H$N>pJs\e(B (`(' ML\e$BL>\e(B [ ` ' ML\e$BHV9f\e(B ] `)')
%l \e$B%a!<%j%s%0%j%9%H$G$NHV9f\e(B
%@@ \e$B:G=i$N\e(B MIME \e$B%Q!<%H$,\e(B multipart/mixed \e$B$N>l9g$K\e(B `@@'
-%~ \e$BD>A0$N9`L\$,6u$N>l9g$K\e(B ` '
+%~ \e$BD>A0$N9`L\$,6u$G$J$$>l9g$K\e(B ` '
@end group
@end example
%# mailing list information (`(' ML-name [ ` ' ML-number ] `)')
%l number in the mailing list
%@@ `@@' only if the first MIME part is multipart/mixed
-%~ ` ' only if previous column is empty
+%~ ` ' only if previous column is not empty
@end group
@end example