Hi, 

It looks very obscure and is certainly nothing that could be executed in 
> any version of SageMath (neither in command line nor in the notebook). 
>
>
Indeed it was not very clear... Aishen was actually referring to the 
Carter-Penrose diagram of the manifold examples 
<https://sagemanifolds.obspm.fr/examples.html>. 
And he discovered a bug in this notebook (not in Sage code), which appeared 
as a consequence of #25510 (merged in Sage 8.3.beta5).
The corrected notebook is here:
http://nbviewer.jupyter.org/github/sagemanifolds/SageManifolds/blob/master/Worksheets/v1.3/SM_Carter-Penrose_diag.ipynb

Thank you Aishen for the report!

Best wishes,

Eric.

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