Rename variabelen_printen_oefenen to variabelen_printen_oefenen.ipynb #424

Job	Run time
call-workflow / get-branches	3s
call-workflow / build-books (PythonProgrammeren2)	45s
call-workflow / build-books (manual_description)	8s
call-workflow / build-books (main)	9s
call-workflow / deploy-books	30s
call-workflow / summarize	6s
	1m 41s

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