Equal nodes?

Is there a way to tell dot that a node and another one are the same, even if they have different labels?

I have these nodes (which are names of sets)

(q0 q2 q1)

(q0 q1 q2)

Also, I have these two:

(q2 q1) (q1 q2)

So, in set theory, they're equivalent.

But Dot doesn't know that, so instead, it creates 2 different nodes. I could make the combinations of items in the sets, and then put them there but Dot draws them even if there's no edge that leads to them.

Is there a way to:

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