Zwei mal Zwei

Dieses Notebook berechnet 2 x 2.

... # 

Ellipsis

assert zwei_mal_zwei == 4

---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
Cell In[2], line 1
----> 1 assert zwei_mal_zwei == 4

NameError: name 'zwei_mal_zwei' is not defined