NB 22: kko.SecondarySectorProduct.instances() seems to run extremely long

[cknoll]

This part

for i in kko.SecondarySectorProduct.instances(): print(i)

of notebook 22 runs much longer than expected. I interrupted after approx. 15min. No line had been printed up to then.

If this is normal there should be a warning in the code.

[mkbergman]

Not sure what the source of the issue is. Did you run the previous two cells?