G = Graph({'A':['B','C']})
G.show()
give this strange message
/opt/sagemath-9.0/local/lib/python3.7/site-packages/matplotlib/font_manager.py:281:
UserWarning: Matplotlib is building the font cache using fc-list. This may
take a moment.
'Matplotlib is building the font cache using fc-list. '
help is welcome
Big thanks
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