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diff --git a/src/Common/Helper.v b/src/Common/Helper.v
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+++ b/src/Common/Helper.v
@@ -1,3 +1,21 @@
+(*
+ * CoqUp: Verified high-level synthesis.
+ * Copyright (C) 2019-2020 Yann Herklotz <yann@yannherklotz.com>
+ *
+ * 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 <https://www.gnu.org/licenses/>.
+ *)
+
Module Option.
Definition default {T : Type} (x : T) (u : option T) : T :=