2. Toolbar
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## 2. Toolbar

The toolbar contains 6 tools:

- `Open file`: Open a new graph.

- `Save file`: Save the current graph.

- `Print`: Print the current graph.

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

- `Redo`: Redo the last undo operation.

- `Snapshot`: Record an image of the current view.

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