Consider the stochastic matrices M₁ = 0 * 0 * 0 * 0 * 0 0 * 0 * 0 * " M₂ 0 * 0 * 0 0 * 0 * " M3 = * 0 0 0 * * 0 0 * * 0 * where all entries marked with * are greater than 0. For each of them, find the number of commu- nicating classes, and decide if they are closed (briefly justify).

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