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-rw-r--r--chapter-7/propagators.scm15
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diff --git a/chapter-7/propagators.scm b/chapter-7/propagators.scm
index 3b54e47..acd45b4 100644
--- a/chapter-7/propagators.scm
+++ b/chapter-7/propagators.scm
@@ -1,3 +1,18 @@
+;;; Copyright © 2024 David Thompson <dthompson2@worcester.edu>
+;;;
+;;; This program 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.
+;;;
+;;; This program 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/>.
(use-modules (ice-9 match)
(srfi srfi-9)
(srfi srfi-9 gnu)