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I have the following kripke structure:

enter image description here

I need my model to follow the LTL constraint that state d will be visited infinitely often:

LTLSPEC  G F (modelState=d)

This constraint fails due to existence of the loop .... b->c->b->c ......

Question: What would be a solution to this problem? This may be related to fair traces, but I am not very familiar with that, or how to indicate d as a fair state in NuSMV.

I am learning model checking on my own and I appreciate your help very much.

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