* `sub()` with `max_depth=None` now handles "monotonic" transitions with finite states. Full absorbing Markov chain calculation still under consideration. * `sub()` no longer accept sequence input. * Some minor formatting fixes.
* `sub()` with `max_depth=None` now handles "monotonic" transitions with finite states. Full absorbing Markov chain calculation still under consideration. * `sub()` no longer accept sequence input. * Some minor formatting fixes.