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https://github.com/xinetzone/d2py/blob/main/doc/topics/tools/sphinx/thebe/events.ipynb 
Fetch for https://api.github.com/repos/xinetzone/d2py/contents/doc/topics/tools/sphinx/thebe?per_page=100&ref=main failed: {"message":"Not Found","documentation_url":"https://docs.github.com/rest/repos/contents#get-repository-content","status":"404"}
CustomError: Fetch for https://api.github.com/repos/xinetzone/d2py/contents/doc/topics/tools/sphinx/thebe?per_page=100&ref=main failed: {"message":"Not Found","documentation_url":"https://docs.github.com/rest/repos/contents#get-repository-content","status":"404"}
    at new nM (https://ssl.gstatic.com/colaboratory-static/common/8f8a028fad0fa8abbc0689c7520a5a43/external_binary.js:2449:68)
    at ua.program_ (https://ssl.gstatic.com/colaboratory-static/common/8f8a028fad0fa8abbc0689c7520a5a43/external_binary.js:2432:436)
    at ya (https://ssl.gstatic.com/colaboratory-static/common/8f8a028fad0fa8abbc0689c7520a5a43/external_binary.js:16:57)
    at ua.next_ (https://ssl.gstatic.com/colaboratory-static/common/8f8a028fad0fa8abbc0689c7520a5a43/external_binary.js:14:195)
    at kaa.next (https://ssl.gstatic.com/colaboratory-static/common/8f8a028fad0fa8abbc0689c7520a5a43/external_binary.js:17:48)
    at b (https://ssl.gstatic.com/colaboratory-static/common/8f8a028fad0fa8abbc0689c7520a5a43/external_binary.js:17:309)
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