P$1"\mathrm{.}3\mathrm{.}3\mathrm{.}4$ P$2"\mathrm{.}2\mathrm{.}2\mathrm{.}4\mathrm{.}20\mathrm{.}5\mathrm{.}5\mathrm{.}6\mathrm{.}1\mathrm{.}1\mathrm{.}2\mathrm{.}200\mathrm{.}8$ c Identify all closed sets of states. d Is this chain ergodic?