I am not sure that 4_2_it is correct. It is true that I woundn't attempt to break down the whole of small stakes no-limit holdem like this. There are quite a lot of relatively common, simple situations, that frequently come up though. For instance: Hero raises from MP with QQ pre-flop then bets pot heads-up into an unknown LP caller on a ten high double suited flop. What is a good line for the turn and river if called?