[math] \newcommand{\NA}{{\rm NA}} \newcommand{\mat}[1]{{\bf#1}} \newcommand{\exref}[1]{\ref{##1}} \newcommand{\secstoprocess}{\all} \newcommand{\NA}{{\rm NA}} \newcommand{\mathds}{\mathbb}[/math]

For the Land of Oz example (Example), make rain into an absorbing state and find the fundamental matrix [math]\mat{N}[/math]. Interpret the results obtained from this chain in terms of the original chain.