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diff --git a/src/meantools_expand.h b/src/meantools_expand.h
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+/*
+Copyright 2015-2022 Ian Jauslin
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+#ifndef MEANTOOLS_EXPAND_H
+#define MEANTOOLS_EXPAND_H
+
+#include "types.h"
+
+// read arguments
+int tool_expand_read_args(int argc, const char* argv[], Str_Array* str_args, Meantools_Options* opts);
+// expand a flow equation
+int tool_expand(Str_Array str_args, Meantools_Options opts);
+
+#endif
+
+