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https://github.com/meyer-nils/torch-fem/blob/main/examples/optimization/planar/topology%20orientation.ipynb 
Could not find topology orientation.ipynb in https://api.github.com/repos/meyer-nils/torch-fem/contents/examples/optimization/planar?per_page=100&ref=main
CustomError: Could not find topology orientation.ipynb in https://api.github.com/repos/meyer-nils/torch-fem/contents/examples/optimization/planar?per_page=100&ref=main
    at new pM (https://ssl.gstatic.com/colaboratory-static/common/bb4df9c9e3fd776a5fce9834a0519367/external_binary.js:2444:68)
    at va.program_ (https://ssl.gstatic.com/colaboratory-static/common/bb4df9c9e3fd776a5fce9834a0519367/external_binary.js:2431:442)
    at ya (https://ssl.gstatic.com/colaboratory-static/common/bb4df9c9e3fd776a5fce9834a0519367/external_binary.js:16:57)
    at va.next_ (https://ssl.gstatic.com/colaboratory-static/common/bb4df9c9e3fd776a5fce9834a0519367/external_binary.js:14:195)
    at kaa.next (https://ssl.gstatic.com/colaboratory-static/common/bb4df9c9e3fd776a5fce9834a0519367/external_binary.js:17:48)
    at b (https://ssl.gstatic.com/colaboratory-static/common/bb4df9c9e3fd776a5fce9834a0519367/external_binary.js:17:309)
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