'What is the best way to implement parallel state machine in NuSMV version 2.6?

I am trying to convert a state machine (given in scxml) to NuSMV version 2.6, and I came across this in the user manual: enter image description here

What is the best way to go around it? What is the best way to represent a parallel state machine in NuSMV without processes? There is the flatten method, but it is very complicated when there are more than 3 states. So I seek a better way.

Thank you!



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