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+## tree
+```sh
+.
+├── util.ipynb
+├── util.py
+└── workdir
+    └── main.ipynb
+```
+
+## util.py
+```py
+get_ipython().run_line_magic("run", "../util.ipynb")
+```
+
+## util.ipynb
+```py
+In [1]: import numpy as np
+```
+
+## workdir/main.ipynb
+```py
+In [1]: run ../util
+In [2]: np.arange(5)
+Out[2]: array([0, 1, 2, 3, 4])
+```
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