What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: David is an electrician or Michael is not happy. Michael is not listening to a song or Charles is curious. For all x_11, x_11 will listen to a song or x_11 is happy. If Charles were curious, then David is an electrician.
If Michael were happy, then David is an electrician can be inferred via the rewriting rule.