What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If Susan makes tea, then it is late. If William plays a game, then Joseph is happy. Sarah is not a bartender or William is playing a game. If it is late, then Joseph is happy. Sarah is a bartender or Susan is making tea.
If Susan makes tea, then Joseph is happy. Susan is making tea or William is playing a game.