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diff --git a/dviware/dvisirule/dvisirule-expg.mk b/dviware/dvisirule/dvisirule-expg.mk
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+#
+# Copyright (C) 2012-2022 Jiro Senju
+#
+# This package 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 2 of the License, or
+# any later version.
+#
+# This package 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 package. If not, see <http://www.gnu.org/licenses/>.
+#
+
+# Splits the given DVI into some pages according to the generated
+# filenames which are the given make-targets.
+# Those filenames have the absolute page-numbers.
+
+%.sidvi: %.dvi
+ "${DVITYPE}" -show-opcodes $< |\
+ awk -f "${Marker}" |\
+ "${SIRULE}" $< $@
+
+%.dvi: range = $(basename $@)
+%.dvi:
+ "${DVISELECT}" -i "${Input}" -o $@ -s =${range}