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diff --git a/contrib/hdtbl/examples/color_boxes.roff b/contrib/hdtbl/examples/color_boxes.roff
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+++ b/contrib/hdtbl/examples/color_boxes.roff
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+.ig
+color_boxes.roff
+
+This file is part of groff, the GNU roff type-setting system.
+
+Copyright (C) 2005-2020 Free Software Foundation, Inc.
+written by Joachim Walsdorff <Joachim.Walsdorff@urz.uni-heidelberg.de>.
+
+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/>.
+..
+.
+.if !d sopath \
+.  ds sopath
+.
+.so \*[sopath]examples/common.roff
+.
+.\" Seed the random number generator for reproducible builds.
+.random-seed 131545532 19201711
+.
+.H Horizontal Rules and Boxes .br with Randomly Colored Border and Background
+.PN 25 Text before horizontal rule.
+.TBL border=.5n bc=green bgc=red width=7c tal=c csp=.2n cpd=.3n .TR .TD .ETB
+.PN 10 Text after horizontal rule and before table.
+.de ctab
+.nr ? 0 1
+.PN 5 .random# ".defcolor color\En+? rgb \E*[#random]" 
+.TD ".TBL border=1c bc=color1 csp=0 cpd=0 height=3c bgc=color2" .TR .TD .ETB
+..
+.
+.TBL tal=c border= csp=0 cpd=0 cols=5 width=3c
+.PN 2 .TR ".PN 5 .ctab"
+.ETB 
+.PN 15 Text after table.
+.TBL border=.5n bc=color1 bgc=color2 width=15c tal=c csp=.2n cpd=.3n .TR .TD .ETB
+.PN 25 Text after horizontal rule.
+.
+.\" Local Variables:
+.\" mode: nroff
+.\" fill-column: 72
+.\" End:
+.\" vim: set filetype=groff textwidth=72: