Fig. 3: Square network and two of its inflations.

Similar to the triangle network of Fig. 2, the state τ is generated using two copies of the sources and channels used to generate ϱ. Then, one goes to a higher-order inflation by using three copies of the sources and the local channels. By rewiring one obtains the inflated state ξ. Again, one has several equalities between the marginals of ϱ, τ, and ξ. Parties with a link of same color are connected by an identical source, as in Fig. 2. The labels X, \(X^{\prime}\), X″ (X = A, B, C) denote the parties of the states.