Maybe what you want is not a Markov model, but a stochastic context-free grammar: http://en.wikipedia.org/wiki/Stochastic_context-free_grammar http://en.wikipe

Maybe what you want is not a Markov model, but a stochastic context-free grammar: http://en.wikipedia.org/wiki/Stochastic_context-free_grammar http://en.wikipedia.org/wiki/Stochastic_context-free_grammar