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diff --git a/tmac/tests/an_avoid-two-font-denial-of-service.sh b/tmac/tests/an_avoid-two-font-denial-of-service.sh
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+#!/bin/sh
+#
+# Copyright (C) 2020 Free Software Foundation, Inc.
+#
+# This file is part of groff.
+#
+# groff is free software; you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# groff is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+# for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+
+groff="${abs_top_builddir:-.}/test-groff"
+
+# That's six pairs of parentheses below.
+"$groff" -Tascii -P-cbou -man <<EOF | grep -q '( ) ( ) ( ) ( ) ( ) ( )'
+.TH sample 1 2020-09-16 "groff test suite"
+.SH Name
+sample \- test subject for groff
+.PP
+Don't DoS me, bro!
+.BI ( \\ )
+.BR ( \\ )
+.IB ( \\ )
+.IR ( \\ )
+.RB ( \\ )
+.RI ( \\ )
+EOF