2. Main window : Tools bar
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## 2. Main window : Tools bar

The tool bar contains 5 tools :

- `Open file` : Open a new graph.

- `Save file` : Save current graph.

- `Print` : Print the current graph.

- `Undo` : Undo the last operation on the graph.

- `Redo` : Redo the last undo operation.

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