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docs/getting_started/online_sandbox/sandbox_intro.md

@@ -13,5 +13,4 @@ You can open the sandbox tutorial in one of two ways. You may be forced to use o
 - Open in [Google Colab](https://githubtocolab.com/casact/chainladder-python/master/docs/getting_started/online_sandbox/demo-blank-concurrent.ipynb) (faster, but a free Google Account is required)
 - Open in [Binder](https://mybinder.org/v2/gh/casact/chainladder-python/master/docs/getting_started/online_sandbox/demo-blank-concurrent.ipynb) (slower, no sign up required)
 
-
 Just in case you want a copy of the sandbox tutorial notebook, you can download it [here](https://github.com/casact/chainladder-python/blob/master/docs/getting_started/online_sandbox/demo-blank-concurrent.ipynb).