Solution: Consult iTunes course for full detailed solutions.
The stationary probabilities are proportional to the degrees. Each corner
square has degree 3, each edge square has degree 5, and each normal square
has degree 8. The total degree is 420 = 3 x 4 + 24 x 5 + 36 x 8 (which is also twice
the number of edges in the network). Thus, the the stationary probability is
3/420 for a corner square, 5/420 for an edge square, and 8/420 for a normal square.

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