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-rw-r--r--Puzzle19.hs18
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diff --git a/Puzzle19.hs b/Puzzle19.hs
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--- a/Puzzle19.hs
+++ b/Puzzle19.hs
@@ -1,4 +1,20 @@
--- Author: Yuchen Pei (me@ypei.me)
+{-
+Copyright (C) 2017 Yuchen Pei.
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero 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 Affero General Public
+License along with this program. If not, see
+<https://www.gnu.org/licenses/>.
+-}
import Data.Map (Map)
import qualified Data.Map as Map
import Data.List.Split (splitOn)